Gross II Unit 1 Flashcards
(334 cards)
1
Q
Sensory innervation to the face
A
Trigeminal nerve (C.N. V)
2
Q
Motor innervation of face
A
Facial Nerve (C.N. VII)
3
Q
Name branches of Trigeminal Nerve.
Where does each distribute?
A
V1 Ophthalmic Nerve - face and scalp
V2 Maxillary Nerve - cheek and area lateral to orbit
V 3Mandibular Nerve - chin and temporal area
4
Q
Name branches of Ophthalmic Nerve.
Where does each distribute?
A
Supraorbital nerve - above eye up toward top of scalp (end of vertex)
Supratrochlear nerve - medial to supraorbital nerve
External nasal nerve - nose
Infratrochlear nerve - bridge of nose/lacrimal area
Lacrimal nerve - along top of upper eyelid
5
Q
Name branches of Maxillary Nerve.
Where does each distribute?
A
Zygomaticotemporal nerve - temporal area
Zygomaticofascial nerve - lateral cheeks
Infraorbital nerve - below eye/cheek
6
Q
Which nerve is most frequently injured due to blows to the face?
A
Infraorbital nerve
7
Q
Name branches of the Mandibular Nerve.
Where does each distribute?
A
Auriculotemporal nerve - along temporal or lateral head region
Buccal nerve - Cheek/lateral to mouth
Mental nerve - Chin
8
Q
Condition characterized by sudden attacks of severe pain in the area of sensory distribution of trigeminal nerve, mostly seen in maxillary division and not so much in opthalmic.
A
Trigeminal Neuralgia/Tic Douloureux
9
Q
Sensory innervations of the posterior aspect of neck and scalp come from what? What its branches and innervations?
A
Posterior (Dorsal) Primary Rami of C2-C4
- Greater Occipital Nerve (Posterior Primary Ramus of C2): occipital region
- Third Occipital Nerve (Posterior Primary Ramus of C3): upper part of back of neck
- Posterior Primary Ramus of C4: lower part of back of neck
10
Q
Is C1 motor or sensory?
A
Motor
11
Q
What is the sensory innervation of the anterior lateral aspect of the neck? What are its branches and their innervations?
A
Cervical Plexus (formed by anterior primary rami [C2-C4] of C1-C4)
- Lesser Occipital Nerve (C2): lateral part of occipital region, posterior to ear
- Great Auricular Nerve (C2,C3): angle of mandible, inferior to ear, accompanies external jugular vein
- Transverse Cervical Nerve (C2,C3): supplies anterior surface of neck (throat)
- Supraclavicular Nerve (C3,C4): lateral surface of neck
12
Q
Where do motor fibers of Cervical Plexus arise?
A
Ansa Cervicalis
13
Q
What are the parts of the Ansa Cervicalis? Where does each come from? What muscles do they supply?
A
- Superior Root - from C1 (or C1 and C2); descends from hypoglossal nerve to inferior root
- Inferior Root - from C2 and C3; descends from cervical nerve branches to superior root
- They supply three of the four infrahyoid muscles: STERNOHYOID, STERNOTHYROID, and OMOHYOID
14
Q
Where infrahyoid muscle receives innervation exclusively from C1 via hypoglossal nerve?
A
Thyrohyoid
15
Q
Discuss the Phrenic Nerve. Origin? Innervations? Location?
A
- Part of the cervical plexus; from C3, C4, and C5
- Motor function: diaphragm; Sensory function: membranes of thorax and abdomen
- On neck lying on anterior surface of anterior scalene muscle –> thorax
16
Q
Name superficial muscles of the neck.
A
Platysma
Sternocleidomastoid
Trapezius
17
Q
Platysma: origin? insertion? nerve? fxn?
A
- Superficial fascia over pectoralis major and deltoid muscles
- Lower border of mandible and angle of mouth
- Cervical branch of Facial Nerve (C.N. VII)
- Depresses mandible, draws down corner of mouth
18
Q
Sternocleoidmastoid muscle: origin? insertion? nerve? fxn?
A
- Sternal head from FRONT OF THE MANUBRIUM, clavicular head from the medial third of clavicle
- Lateral surface of mastoid process, lateral half of the superior nuchal line
- Accessory nerve (C.N. XI)
- Chief flexor of head
19
Q
Pathological contraction of SCM where head is tilted toward and face away from affected side
A
Torticollis (Wryneck)
20
Q
Forms of Torticollis (w/ description)
A
Congenital - from fibrous tissue tumor which develops at or near birth
Muscular - due to birth injury
Spasmodic - due to abnormal tonicity (adults)
21
Q
Trapezius: origin, insertion, nerve, function
A
O: external occipital protuberance, ligamentum nuchae, spinous process of C7 and all thoracic vertebrae
I: Lateral third of clavicle, spine of scapula, and acromion process
N: Accessory nerve (C.N. XI) and C3 and C4 from cervical plexus
F: Upper portion elevates, middle portion retracts, and lower portion depresses SCAPULA
22
Q
Coordination between muscles that abduct humerus and those that rotate scapula
A
Scapulohumeral rhythm
23
Q
Drains blood from face and scalp and contains a large amount of cerebral blood
A
External jugular vein
24
Q
Vein that forms immediately below the parotid gland by union of the retromandibular vein and posterior auricular vein
A
External jugular vein
25
External jugular vein forms immediately below parotid gland by union of what veins?
Retromandibular vein
| Posterior auricular vein
26
Only vein to vertically run downward and backward along the lateral surface of the sternocleidomastoid. What vein does it empty into?
External jugular vein
| Subclavian vein
27
Tributaries of external jugular vein and describe location.
Retromandibular vein - behind mandible
Posterior auricular vein - behind ear
Posterior external jugular vein - posterior scalp
Anterior jugular vein - throat/chin
Transverse cervical vein - above suprascapular
Suprascapular - branches off around lower neck
28
Describe prominent external jugular vein
Normal venous pressure; external jugular invisible topographically
In Congestive heart failure, superior vena cava obstruction creates prominence throughout length
Opera singers/bagpipe players may develop prominent external jugular due to increased intrathoracic pressure during singing/playing
29
Lymph nodes running along the external jugular vein are superficial to what muscle?
Sternocleidomastoid
30
Boundaries of posterior triangle
Anterior boundary: posterior border of sternocleidomastoid
Posterior boundary: anterior border of trapezius
Inferior boundary: superior border of middle third of clavicle
31
Boundaries of anterior triangle
Superior boundary: inferior border of mandible
Anterior boundary: anterior midline
Posterior boundary: anterior border of sternocleidomastoid
32
What forms the roof of the anterior triangle?
Deep cervical fascia, superficial cervical fascia, and platysma
33
Subdivisions of the anterior triangle
Submental triangle
Submandibular (diagastric) triangle
Carotid triangle
Muscular triangle
34
What anterior triangle subdivision is located below the chin?
Submental triangle
35
Only one of the anterior triangle subdivisions which is unpaired.
Submental triangle
36
Boundaries, floor, and contents of the submental triangle.
B: Left and right anterior bellies of digastric and body of hyoid bond
F: Mylohyoid muscle
C: Minor veins and lymph nodes (submental nodes)
37
Boundaries, floor, and contents of submandibular (digastric) triangle.
B: Inferior border of the mandible, anterior belly of digastric, posterior belly of digastric
F: Mylohyoid and hyoglossus muscles
C: Submandibular gland (one of three major salivary glands along parotid and sublingual), internal carotid artery, facial artery, internal jugular vein, glossopharyngeal nerve (C.N. IX) and Vagus nerve (C.N. X)
38
Why should one be careful when treating a patient for TMJ?
Mandible is close to the submandibular triangle, which contains numerous neurovascular structures
39
Boundaries, floor, and contents of the carotid triangle (vascular triangle)
B: posterior belly of digastric, superior belly of omohyoid, and anterior border of sternocleidomastoid
F: thyrohyoid, hyoglossus, and inferior and middle constrictor muscles
C: common and internal carotid arteries, external carotid artery (and three of its branches - superior thyroid artery, lingual artery, and facial artery -), and tributaries of internal jugular vein
40
Boundaries, floor, and contents of muscular triangle
B: Superior belly of omohyoid, anterior midline of neck, anterior border of SCM
F: Posterior layer of pretracheal fascia
C: Sternohyoid and sternothyroid muscles, thyroid gland, trachea, and esophagus
41
Point of attachment for many muscles between mandible and larynx
Hyoid bone
42
This bone may be broken due to strangulation
Hyoid bone
43
Primary function of infrahyoid muscles
Move hyoid bone and larynx
44
Name the infrahyoid muscles
Omohyoid
Sternohyoid
Sternothyroid
Thyrohyoid
45
Omohyoid: origin, insertion, nerve, function
O: inferior belly of omohyoid from upper border of scapula; ends in intermediate tendon deep to the sternocleidomastoid muscle; superior belly extends upward from tendon
I: Body of hyoid bone
N: Ansa Cervicalis (C1,C2,C3)
F: Depresses hyoid bone and larynx
46
Sternohyoid: origin, insertion, nerve, function
O: Posterior surface of manubrium and medial end of clavicle
I: body of hyoid bone
N: Ansa Cervicalis (C1,C2,C3)
F: depresses the hyoid bone and larynx
47
Sternothyroid: origin, insertion, nerve, function
O: posterior surface of manubrium, inferior to origin of sternohyoid
I: oblique line of lamina of thyroid cartilage
N: Ansa Cervicalis (C1,C2,C3)
F: depresses the larynx
48
Thyrohyoid: origin, insertion, nerve, function
O: oblique line on the lamina of the thyroid cartilage
I: body of the hyoid bone
N: C1 through hypoglossal nerve
F: depresses the hyoid bone
49
Infrahyoid muscles depress the hyoid and larynx to accomplish what functions?
Swallowing
Speech
Breathing
If hyoid fixed diastric depresses mandible opening jaw against resistance
50
Dense, sheet-like layer of connective tissue
Fascia
51
Surrounds and supports both the superficial and deep structures of the neck
Cervical fascia
52
What are the two major layers of the cervical fascia?
Superficial cervical fascia
| Deep cervical fascia
53
Thin layer of connective tissue which encloses the platysma muscle, and contains cutaneous nerves, superficial veins and lymph nodes
Superficial cervical fascia
54
What are the layers of the deep cervical fascia? What is the function of each?
Investing layer of the deep cervical fascia - deep to superficial; encloses the sternocleidomastoid and trapezius
Pretracheal fascia - encloses thyroid gland, trachea, esophagus
Prevertebral fascia - encloses the vertebral column and the deep muscles of the back
Carotid Sheath - cylinder of fascia extending from base of skull to root of neck
55
What does the carotid sheath of the deep cervical fascia contain?
Common carotid artery, internal carotid artery, internal jugular vein, vagus nerve, and deep cervical lymph nodes
56
Function and clinical significance of fascial layers
Slippery surface to reduce friction (allows gross movements of head and neck; and swallowing)
Adhesion, which can be reduced with myofascial release
Can serve as a channel for infection: (1) pretracheal fascia can spread from head and neck to mediastinum directly, (2) Dental abscess, strepthroat (fistula)
Cancer involving deep cervical lymph nodes can compress internal jugular veins (can also cause headaches)
57
Opening through which structures of the neck pass into the thorax
Superior thoracic aperture
58
What are the boundaries of the superior thoracic aperture? Hint: its kidney-shaped.
First thoracic vertebra
First ribs and their cartilages
Manubrium of sternum
59
Name all the major arteries and veins that pass through the superior thoracic aperture
```
Brachiocephalic trunk
Left common carotid artery
Left subclavian artery
Internal thoracic artery
Brachiocephalic vein
```
60
Name the nerves that pass through the superior thoracic aperture.
Phrenic nerve
Vagus nerve
Recurrent laryngeal nerve
Sympathetic trunk
61
Name the viscera that can be found in the superior thoracic aperture.
Trachea, esophagus, cervical pleura, apex of lung, and thymus
62
Explain how the lung may collapse with a neck injury
Cervical pleura and lung apex pass through superior thoracic aperture, posterior to SCM origin
A broken 1st rib on penetrating wound to neck can cause collapse lung
63
Condition where broken 1st rib due to penetrating wound can cause lung to collapse
Atelectasis
64
Where is the thymus located? What does the thymus produce? What is the thymus blood supply? What innervates the thymus?
Posterior to the manubrium
It produces T-lymphocytes
Internal thoracic artery
Stellate ganglion of sympathetic trunk and vagus
65
What muscles lie anterior to the thymus and thyroid gland?
Sternohyoid
| Sternothyroid
66
What does the thyroid gland produce?
Thyroxine
| Calcitonin
67
Parts of the thyroid gland
Left lobe
Right lobe
Isthmus
50% of the time, pyramidal lobe
68
Muscle which connects the isthmus of the thyroid glad with hyoid bone
Levator glandulae thyroideae muscle
69
Which arteries supply blood to thyroid gland? Where does each branch from?
Superior Thyroid artery (from the external carotid artery)
Inferior thyroid artery (from the thyrocervical trunk)
(Variation) Thyroid Ima Artery (brachiocephalic trunk)
70
Which veins run from the thyroid gland? Where does each go?
Superior thyroid vein (to the internal jugular vein)
Middle thyroid vein (to the internal jugular vein)
Inferior thyroid vein (to the brachiocephalic vein)
71
What does the thyroid gland innervate?
Superior, middle, and inferior cervical sympathetic ganglia
72
Condition where thyroid gland is abnormally enlarged, seen in anterior neck
Goiter
73
What is endemic goiter?
Goiter due to dietary deficiency of iodine, which is necessary to produce thyroxine; gland increases to increase output; hormone largely inactive; symptoms include hypothyroidism (moon face and weight gain
74
What is exothalamic goiter?
Goiter due to autoimmune disease; thyroid stimulating immunoglobulins bind to receptor site cause overactivity of gland hormone and active; symptoms include hyperthyroidism (Granes disease: hunger, skinny, hot) and bulging eyes (fat deposit in center behind eyes)
75
This nerve branches off the vagus within the thorax and then travels up into the neck to supply motor innervation to all but one of the laryngeal muscles
Recurrent laryngeal nerve
76
Describe the recurrent laryngeal nerve location, where is runs, and what is controls?
It branches off the vagus within the thorax and then travels up into the neck to supply motor innervation to all but one of the laryngeal muscles: speech and airway
77
Which endocrine gland is involved with calcium homeostasis?
Parathyroid gland
78
Small ovoid bodies on posterior surface of the thyroid gland
Parathyroid glands
79
How many parathyroid glands are usually found in body?
Usually there are four. It can vary between two and six.
80
What is the blood supply for the parathyroid gland?
Inferior thyroid artery
| Superior thyroid artery
81
What does the parathyroid gland innervate?
Inferior or middle cervical sympathetic ganglia
82
What are some factors that make performing a thyroid surgery difficult?
Vascularity
Parathyroid glands (essential for life)
Recurrent laryngeal nerve (if damaged, my paralyze half of larynx affecting speech and airway)
83
"Windpipe", begins at larynx at the level of cervical vertebra six and will split into left and right bronchi
Trachea
84
What are cartilaginous rings?
Incomplete supporting rings along the trachea that open posteriorly where the trachealis muscle (smooth) spans
85
What supplies blood to the trachea?
Inferior thyroid artery
86
What innervates the trachea?
Recurrent laryngeal nerve
87
Describe the esophagus.
Muscular tube connecting pharynx to the stomach; begins at cervical vertebra six; lies posterior to trachea
88
Main arteries of the head and neck
Carotid arteries
89
Where does the common carotid artery split?
Carotid triangle
90
What does the common carotid artery split into?
Internal carotid artery
| External carotid artery
91
Which artery is the main source of blood to structures of the neck, face, and scalp (external skull)?
External carotid artery
92
What are the branches of the external carotid artery?
```
Superior thyroid artery
Ascending pharyngeal artery
lingual artery
facial artery
occipital artery
posterior auricular artery
superficial temporal artery
maxillary artery
```
93
Slight dilation of the internal carotid artery where it joins the common carotid. What is this structure's function? What is it innervated by?
Carotid sinus
Baroreceptor (blood pressure sensor): within increased blood pressure, heart rate decreases
Glossopharyngeal nerve (CN IX)
94
Small reddish-brown mass located within or deep to the bifurcation of the common carotid artery. What is this structure's function? What is its innervation?
```
Carotid body
Chemoreceptor: detects changes in the chemical makeup of the blood within carotid
Glossopharyngeal nerve (CN IX)
```
95
Vein deep to the sternocleidomastoid and never topographically visible
Internal Jugular Vein
96
Where does the internal jugular vein begin? What is it a continuation of? Where does it drain?
Jugular foramen
Sigmoid sinus
Brachiocephalic vein
97
Dilation of the internal jugular vein at its origin below the jugular foramen
Superior jugular bulb
98
Tributaries of the internal jugular vein
```
Inferior petrosal sinus
Pharyngeal veins
Facial vein
Lingual vein
Superior thyroid vein
Middle thyroid vein
```
99
Structure of the internal jugular vein with dilation near its termination into the brachiocephalic vein
Inferior Jugular bulb
100
Branches of the glossopharyngeal nerve (CN IX)
```
Tympanic nerve
Branch to the Carotid sinus
Pharyngeal branch
Branch to the stylopharyngeus
Tonsillar Branch
Lingual Branch
```
101
Nerve that is sensory to the tympanic cavity and secretomotor to the parotid gland; senses pain in otitis media
Tympanic nerve
102
Branch of CN IX that is sensory to both the carotid sinus and carotid body; changes in blood pressure and blood gases
Branch to the Carotid Sinus
103
Branch of CN IX that unites with branches from vagus and sympathetic trunk to form the pharyngeal plexus; sensory to pharynx, senses pain in acute pharyngitis, and afferent limb of gag reflex
Pharyngeal branch
104
Branch of CN IX sensory to the mucous membrane over the tonsil and to the soft palate; only muscle of pharynx not innervated by vagus nerve
Branch to the Stylopharyngeus
105
Branch of CN IX sensory to the mucous membrane over the tonsil and to the soft palate; senses pain in tonsillitis
Tonsillar branch
106
Branch of CN IX that supplies taste and general sensation to the posterior third of the tongue
Lingual branch
107
Longest cranial nerve and has extensive distribution in head, neck, thorax, and abdomen; name means "wanderer"
Vagus nerve
108
Where does the vagus nerve emerge? Where does it exit the skull? Do any other nerves exit from the same location?
```
Medulla Oblongata
Jugular foramen
glossopharyngeal nerve (CN IX) and accessory nerve (CN XI)
```
109
Name the two ganglia of the vagus nerve. Are they motor or sensory?
1. Superior (jugular) ganglion: located in jugular foramen, generally smaller
2. Inferior (nodose) ganglion: generally bigger
Both are sensory
110
Functions of nasal cavity
Provide airway
olfaction
warming and moistening inspired air
cleansing inspired air
111
Where does nasal cavity extend?
Nostrils (nares) anteriorly to choanae posteriorly
112
Posterior apertures of the nasal cavity which open into the nasopharynx
Choanae
113
External nose consists of:
Tip: free end of nose
Root: connects the nose to the forehead
Nares: (Nostrils)
Alae: bound the nares laterally
114
What are the boundaries of the nasal cavity? What does each boundary consist of?
Roof: nasal bone, frontal bone, cribriform plate of the ethmoid bone, and body of the sphenoid bone
Floor: Palatine process of the maxilla and the horizontal plate of the palatine bone; both these bones form the HARD PALATE
Medial Wall: septal cartilage, perpendicular plate of the ethmoid bone, and the vomer
115
Condition where the nasal septum does not lie in the median plane
Deviated Septum
116
A severely deviated septum may touch what? What symptom might this create?
The lateral wall
| Difficulty breathing
117
What are causes of a deviated septum?
Congenital malformation
Birth injury
Postnatal injury
118
What makes up the nose's lateral wall?
```
Nasal bone
Frontal process of the maxilla
Lacrimal bone
Ethmoid bone
Inferior nasal concha
perpendicular plate of the palatine bone
Medial pterygoid plate of the sphenoid bone
```
119
What are the structures within the lateral wall?
Superior nasal concha (of the ethmoid)
Middle nasal concha (of ethmoid)
Inferior nasal concha (separate bone)
120
Small space located above and behind the superior nasal concha that receives the opening of the sphenoid sinus
Sphenoethmoidal recess
121
Space below the superior nasal concha that receives the opening of the posterior ethmoidal cells
Superior Meatus
122
The space below the middle nasal concha that receives the openings of the frontal sinus, the maxillary sinus, the middle ethmoidal cells, and the anterior ethmoidal cells
Middle Meatus
123
Rounded projection into the middle meatus where the middle ethmoidal cells open onto this structure
Ethmoidal Bulla
124
A curved slit lying below the ethmoidal bulla within the middle meatus where the frontonasal duct, anterior ethmoidal cells, and maxillary sinus open into this slit
Hiatus Semilunaris
125
Space below the inferior nasal concha that receives the opening of the nasolacrimal duct
Inferior Meatus
126
Connects the lacrimal sac of the orbit to the nasal cavity
Nasolacrimal duct
127
Area just inside each nostril; contains hair, sebaceous glands, and sweat glands
Nasal Vestibule of the Nasal cavity
128
Lower two-thirds of the nasal cavity
Respiratory Region of the nasal cavity
129
Superior nasal concha and the upper one-third of the nasal septum; contains the fibers of the olfactory nerve, which pass down through the cribriform plate
Olfactory region of the nasal cavity
130
Which nerve innervates the special senses of the nasal cavity?
Olfactory nerve (CN 1)
131
Where does general sensory innervation of the nasal cavity come from?
Branches of the maxillary and ophthalmic divisions of the trigeminal nerve (CN V)
132
Where does autonomic innervation (sympathetic and parasympathetic) of the nasal cavity come from?
Pterygopalatine ganglion
133
What provides primary blood supply to the nasal cavity?
Sphenopalatine branch of the maxillary artery
| Anterior ethmoidal branch of the ophthalmic artery
134
Condition of nasal cavity where richness in blood may bleed out
Epitaxis
135
Where do lymph nodes of the nasal cavity drain?
Deep cervical node
136
Cavities found within the bones of the face that develop as outgrowths of the nasal cavity
Paranasal Sinuses
137
What do the paranasal sinuses do?
Facilitates drainage of the sinuses in the face
138
Sinus that lies in the frontal bone. Where does it open into?
Frontal Sinus
| Opens into hiatus semilunaris of the middle meatus via the frontonasal duct
139
Largest of the paranasal sinuses. Where is it found? Where does it open into?
Maxillary Sinus
Lies within Maxilla on each side, lateral to nasal cavity and inferior to the orbit
Opens into the hiatus semilunaris within the middle meatus.
140
Which paranasal sinus is present at birth?
Maxillary sinus
141
Which paranasal sinus is the most prone to infection? Why?
Maxillary Sinus
| Poor drainage due to its superior positioning
142
Sinus that lies within the sphenoid bone. Where does it open into?
Sphenoid Sinus
| Opens into the sphenoethmoidal recess
143
Sinus that consists of several groups of ethmoidal cells lying in the ethmoid bone between the orbit and nasal cavity. List these groups of cells
Ethmoidal Sinus
- Posterior ethmoidal cells - open into the superior meatus
- Middle ethmoidal cells: open into the ethmoidal bulla within the middle meatus
- Anterior ethmoidal cells: open into the hiatus semilunaris within the middle meatus
144
Where can a nasal cavity infection spread? (Hint: there are six locations)
1. Lacrimal apparatus and conjunctiva via nasolacrimal duct --> CONJUNCTIVITIS "pink eye"
2. Paranasal sinus --> "Sinusitis"
3. Nasopharynx (MC) --> "Acute Pharyngitis"
4. Pharyngotympanic tube --> "Otitis Media" (ear infections)
5. Anterior cranial fossa via Cribriform plate --> "meningitis" or "Brain abscess"
6. Mastoid air cells from inner ear via aditus --> "Mastoiditis"
145
Amoeba found in stagnant warm water that eats brains
Naegleria fowler
146
What may CSF dripping from nose indicate?
Damage to the cribriform plate
| Halo effect insinuates CSF dripping
147
What are the branches of the vagus in the head and neck?
```
Meningeal Branch
Auricular Branch
Pharyngeal Branch
Superior Laryngeal Nerve
Recurrent Laryngeal Nerve
```
148
Which vagus branches in the head and neck make up the superior ganglia?
Meningeal branch and Auricular branch
149
Branch of the vagus arising from the superior ganglion that supplies the dura mater with sensory innervation
Meningeal Branch
150
Branch of the vagus nerve that arises from the superior ganglion and is sensory to the auricle, the floor of the external auditory meatus, and the tympanic membrane
Auricular branch
151
Which of the vagus nerves of the head and neck make up the inferior ganglion?
Pharyngeal branch
Superior laryngeal nerve
Recurrent laryngeal nerve
152
Branch of the Vagus that arises from the inferior ganglion and is the chief motor nerve to the pharynx muscles and soft palate; also the efferent limb of the gag reflex
Pharyngeal branch
153
What is the origin of the pharyngeal branch of the vagus?
Cranial part of the accessory nerve CN XI
154
How does the pharyngeal plexus form?
Pharyngeal branch of the vagus joints with branches from the glossopharyngeal nerve and sympathetic trunk
155
What does the pharyngeal plexus innervate?
Motor to all muscles of the pharynx MINUS the stylopharyngeus (innervated by the glossopharyngeal nerve)
Motor to all muscles of the soft palate MINUS the tensor veli palatini (innervated by the Trigeminal nerve)
156
Innervates all muscles of the pharynx and soft palate minus a couple exceptions. What are the exceptions?
Pharyngeal plexus
- Stylopharyngeus - innervated by the glossopharyngeal nerve
- Tensor Veli Palatini - innervated by the Trigeminal nerve
157
Nerve of the vagus that arises from the inferior ganglion and splits into two subnerves. What are these two nerves and their functions?
Superior laryngeal nerve
- Internal laryngeal nerve: SENSORY to the mucous membrane of the larynx superior to the true vocal chords
- External Laryngeal nerve: MOTOR to the cricothyroid and inferior constrictor muscles
158
Nerve that arises from the vagus within the thorax and then ascends, in the groove between the trachea and esophagus, back into the neck. Is it sensory or motor? What structure is it closely applied to?
Recurrent laryngeal nerve
- BOTH sensory and motor
- - Thyroid Gland
159
What are the boundaries of the oral cavity?
Roof: the palate
Floor: the tongue and oral mucosa (supported by the mylohyoid and geniohyoid muscles)
Anterior and lateral boundaries: the lips and cheeks
Posterior boundary: oropharyngeal isthmus, demarcated by the palatoglossal arch
160
What are the two parts making up the oral cavity?
Oral vestibule
| Oral cavity
161
Portion of the oral cavity which lies between the lips and gums, or cheek and gums, portion of the oral cavity external to the tooth rows
Oral Vestibule
162
What are the openings into the oral vestibule?
1. Labial glands: small salivary glands
| 2. Parotid duct (largest salivary duct): opens lateral to the maxillary second molar within the vestibule
163
Portion of the oral cavity which lies internal to the tooth rows
Oral cavity proper
164
Two mobile musculofibrous folds which bound the opening of the mouth. Each is connected to a gum by what median fold?
Lips
- Frenulum of upper lip
- Frenulum of lower lip
165
Median groove seen externally which extends from the nose to the vermilion border of the upper lip (hint: cleft lip happens here)
Philtrum
166
What are the kissing muscles of the lips?
Orbicularis oris muscle and labial glands
167
What muscle and gland in the cheek are similar to the labial glands in the lips?
Buccinator muscle and buccal glands
168
This structure forms the roof of the mouth and the floor of the nasal cavity and is arched both transversely and anteroposteriorly
Palate
169
What are the parts that makeup the palate?
Hard Palate - forms the anterior two thirds of the palate
| Soft palate - forms the posterior one third of the palate
170
Bony partition between the nasal and oral cavities. What does this consist of?
Hard Palate
- Palatine process of the maxilla (anteriorly)
- Horizontal plate of the palatine bone (posteriorly
171
What foramina does the hard palate contain? How does each function?
Incisive foramen: Transmits the nasopalatine nerves (sensory)
Greater Palatine foramen and lesser palatine foramen: transmits nerves and vessels of the same name
172
What covers the hard palate?
Mucoperiosteum
173
Describe the mucoperiosteum
Along the hard palate, presents a palatine raphe extending to the incisive papilla
174
Mobile fibromuscular fold suspended from the posterior border of the hard palate. What is this structures function? How is its function accomplished?
Soft Palate
- Prevents food and fluid from entering the nose
- - The soft palate elevates during swallowing to close the opening between the nasopharynx above and the oropharynx below
175
The soft palate is continuous with what two lateral arches?
Palatoglossal arch: palatoglossal fold (superficially) + Palatoglossus Muscle (deep to fold)
Palatophargyngeal arch: palatoglossus muscle (deep to the fold)
176
Median projection of the soft palate
Uvula
177
Where does the tonsillar fossa lie?
Between the palatoglossal and palatopharyngeal arches on each side and contains the Palatine Tonsil
178
Musculus Uvulae: O, I, N, F
O: posterior nasal spine
I: mucous membrane of uvula
N: vagus nerve (CN X) via the pharyngeal plexus
F: elevates the uvula
179
Levator Veli Palatini: O, I, N, F
O: inferior surface of temporal bone
I: Aponeurosis of soft palate
N: Vagus nerve (CN X) via the pharyngeal plexus
F: Elevates the soft palate
180
Tensor Veli Palatini: O, I, N, F
Origin: Scaphoid fossa of the medial pterygoid plate, pharyngotympanic tube
Insertion: the tendon winds around the pterygoid hamulus and inserts into the aponeurosis of the soft palate
Nerve: Mandibular division of trigeminal (CN V)
Function: Tenses soft palate, opens pharyngotympanic tube
181
What innervates the hard palate?
Greater palatine and nasopalatine nerves
182
What innervates the soft palate?
Lesser palatine nerve
183
What provides blood supply to the hard palate?
Greater palatine artery (from maxillary)
184
What provides blood supply to soft palate?
Lesser palatine and facial arteries
185
Diagnosis of nerve damage to vagus
Damage to the left vagus nerve causes the uvula to deviate to the right due to paralysis of the musculus uvulae on the left side, and vice versa
186
The branch of the vagus is sensory to the mucous membrane of the larynx below the true vocal folds, and to the trachea and motor to all muscles of the larynx except the cricothyroid
Recurrent laryngeal nerve
187
The recurrent laryngeal nerve innervates all the muscles of the larynx except for which one?
Cricothyroid
188
Clinical consequences of damage to the recurrent laryngeal nerve
Unilateral damage: respiratory distress, hoarseness (partial aphornea)
Bilateral damage: complete aphornea (mute)
189
Causes of damage to the recurrent laryngeal nerve
1. Trauma during thyroid surgery
2. Goiter or thyroid tumor
3. Lung tumor (compression)
4. Aortic aneurysm (left side only)
190
What two parts and their origins form the Accessory Nerve (CN XI)?
Cranial part: originates from the medulla oblongata
| Spinal part: originates from the sides of the spinal cord
191
Describe how cranial and spinal parts of the accessory nerve join.
The spinal part ascends through the FORAMEN MAGNUM and joins the the cranial part.
Both exit through the jugular foramen.
192
Where does the cranial part of the accessory nerve join the vagus? Where do these provided motor fibers travel to?
Inferior vagal ganglion
- Pharyngeal branch of the vagus: to the muscles of the pharynx and the soft palate
- Recurrent laryngeal nerve: to the muscles of the larynx
193
The spinal part of the accessory provides motor fibers for what?
Sternocleidomastoid and trapezius muscles
194
Motor nerve for the tongue. Describe the location.
```
Hypoglossal Nerve (CN XII)
- Originates from the MEDULLA OBLONGATA, and exits the skull through the HYPOGLOSSAL CANAL
```
195
Name the branches of the hypoglossal nerve. Name the function of each.
Meningeal branches: supply dura matter; contribute to cervicogenic headaches (like meningeal branch of Vagus)
Superior Root (C1 & C2) of the Ansa Cervicalis: sternohyoid, sternothyroid, omohyoid
Nerves to thyrohyoid and geniohyoid: C1 fibers that are motor to thyrohyoid and geniohyoid muscles
Lingual branches: motor to extrinsic and intrinsic muscles of tongue
196
Describe the preganglionic and postganglionic fibers of the cervical part of the sympathetic trunk.
Preganglionic Fibers supply structures of head and neck originate from T1 and T3, travel up the trunk and synapse with several cervical ganglia
Postganglionic fibers distribute from the ganglia to the blood vessels, smooth muscle and glands of the head and neck
197
Attachments of tongue
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Hyoid bone
mandible
styloid process
palate
pharynx
```
198
Functions of tongue
Taste
Mastication
Swallowing
Speech
199
Parts of tongue
Apex: rests against incisor teeth
Margin: rests against teeth and gums on each side
Dorsum: the upper surface of the tongue
Inferior surface: the lower surface of the tongue
Root: the attached base of the tongue
200
What part of the tongue lies partly in the oral cavity and partly in the oropharynx?
Dorsum of the tongue
201
V-shaped groove that divides tongue into oral and oropharyngeal parts. Which part is larger?
Sulcus Terminalis
| - Oral part is larger
202
Foramen located at the apex of the V of the sulcus terminalis and is remnant of the embryonic thyroglossal duct
Foramen cecum
203
This structure along the midline of the neck occurs when embryonic thyroglossal duct does not obliterate; may result in a thyroglossal cyst; this is often mistaken for a thyroid tumor
Foramen cecum
204
Describe Filiform papillae
Conical projections with sharply pointed tips
| Generally sensory only, lacks taste buds
205
Describe Fungiform Papillae
Mushroom shaped, contain taste buds
206
Which papillae of the tongue is the largest?
Vallate papillae
207
Describe Vallate papillae
largest of lingual papillae, arranged in V-shaped row in front of the sulcus terminalis, contains taste buds (bitter taste and gag reflex and survival mechanism to poison)
208
Describe foliate papillae
Grooves and ridges along the margin of the tongue, poorly developed in humans. Contain taste buds (sour)
209
Name the lingual papillae
Filiform
Fungiform
Vallate
Foliate
210
A mass of lymphoid tissue found on the oropharyngeal surface of the tongue.
Lingual Tonsil
211
What are the two folds of the tongue?
Median glossoepiglottic fold and lateral glossoepiglottic fold
212
Space on either side of the median glossoepiglottic fold
Vallecula
213
inferior surface of tongue is connected to the floor of mouth by what?
Frenulum of the tongue
214
Condition of some infants where frenulum of the tongue is short superior to inferior and long anterior to posterior, extending to near the apex of the tongue; tongue is strapped to the floor of mouth
Ankyloglossia aka "Tongue-Tied"
| - This condition may impede speech
215
Frenulum usually grows when?
The first year of life
216
Where do nerves, vessels, and extrinsic muscles enter or leave the tongue?
Root of the tongue
217
Name the extrinsic muscles of the tongue
Genioglossus
Hyoglossus
Styloglossus
Palatoglossus
218
Platoglossus: O, I, N, F
O: Soft palate
I: Sides of tongue
N: Vagus nerve (CN X) via the pharyngeal plexus
F: Elevates back of tongue
219
Which of the extrinsic muscles is NOT innervated by the hypoglossal nerve?
Palatoglossus
220
This muscle pulls the tongue forward preventing it from falling backwards blocking the airway
Genioglossus
221
Why is the genioglossus so important?
Constantly pulls the tongue forward; very important for general anesthesia and seizure disorders (epilepsy)
222
Describe the sensory innervation of the anterior two-thirds of the tongue.
General sensation through the lingual nerve, a branch of the mandibular division of the trigeminal nerve (CN V).
Taste through the chorda tympani, a branch of the facial nerve (CN VII)
223
Describe the sensory innervation of the posterior one-third of the tongue
General sensation and taste through the glossopharyngeal nerve (CN IX); includes vallate papillae and taste fibers from CN IX that cross the sulcus terminalis to innervate the vallate papillae allowing the gag reflex in response to bitter tastes
224
Describe blood flow of the tongue
Lingual artery from external carotid flows in, and lingual vein to internal jugular out
225
Name the parts of the teeth. Describe each.
Crown: projects above gums, covered by ENAMEL
Neck: jxn btw crown and root
Root: embedded in alveolar processes of the maxilla and mandible, covered in CEMENTUM
226
This structure lies at cervical levels 1 through 3 and supplies sympathetic innervation to everything in the head
Superior Cervical Ganglion
227
Name the branches of the superior cervical ganglion
Internal carotid nerve
Superior cervical cardiac nerve
Branches to the pharyngeal plexus
228
This structure lies at the cervical vertebral level 6 and supplies the thyroid gland with stimulus. What nerve branches off of it?
Middle cervical ganglion
| - Middle cervical cardiac nerve (to the cardiac plexus)
229
This structure lies at cervical vertebra 7, is often fused with either the middle or inferior cervical ganglion, and gives off a branch to the plexus along the vertebral artery
Vertebral Ganglion
230
This structure lies at cervical vertebra 7 through thoracic vertebra 1 and is formed by the fusion of the inferior cervical ganglion to the first thoracic ganglion
Cervicothoracic (stellate) ganglion
231
What is a branch of the cervicothoracic (stellate) ganglion?
Inferior cervical cardiac nerve (to the cardiac plexus)
| Ansa Subclavia
232
Describe the location of the cervicothoracic (stellate) ganglion.
C7-T1, Posterior to the vertebral artery, anterior to transverse process of C7 and neck of first rib
233
Nerve bundle which loops anterior to the subclavian artery, connecting the vertebral ganglion to the cervicothoracic ganglion
Ansa Subclavia
234
Large, horizontal part of the mandible
Body
235
Largest and sturdiest facial bone
Mandible
236
The upper border of the body, containing the tooth sockets (alveoli)
Alveolar process
237
Vertically ascending part of the mandible
Ramus
238
At the posterior terminus of the body of the mandible
Angle
239
Articulates with the temporal bone to form the temporomandibular joint. What conditions could result from a misalignment of this joint?
Condylar process
- TMJS: temporomandibular joint syndrome
- Migraines
- Arthritis
240
Area of attachment for muscles of mastication
Coronoid process
241
Origin of the genioglossus muscle
Superior mental (genial) spine
242
Origin of the geniohyoid muscle
Inferior mental (genial) spine
243
Origin of the anterior belly of digastric
Digastric fossa
244
Origin of the mylohyoid muscle
Mylohyoid line
245
Location of the sublingual gland
Sublingual fossa
246
Digastric muscle: O, I, N, F
O: posterior belly from the mastoid process, anterior belly from the digastric fossa
I: Both bellies "insert" into the hyoid bone by an intermediate tendon which connects them. Intermediate tendon is strapped to the hyoid bone by a fibrous loop
N: Posterior belly by the cervical branch of the facial nerve (CN VII), anterior belly by the nerve to mylohyoid (CN V)
F: Elevates the hyoid bone and depresses the mandible when hyoid is fixed
247
Mylohyoid muscle: O, I, N, F
O: mylohyoid line
I: body of hyoid bone, median raphe
N: Nerve to mylohyoid (CN V)
F: Elevates hyoid bone and floor of the mouth
248
Geniohyoid muscle: O, I, N, F
O: Inferior mental spine
I: body of hyoid bone
N: C1 fibers through hypoglossal
F: Elevates hyoid bone and bone
249
Genioglossus muscle: O, I, N, F
O: Superior mental spine
I: Tip and entire undersurface of tongue
N: Hypoglossal nerve
F: draws tongue forward, protrudes tip of tongue
250
Hyoglossus Muscle: O, I, N, F
O: body and greater horn of hyoid bone (upper surface)
I: sides of the tongue
N: hypoglossal nerve
F: draws tongue downward (say "ah")
251
This small portion of hyoglossus may take origin from the lesser horn of the hyoid bone
Chondroglossus
| - It is cartilaginous and ossifies through life
252
Styloglossus Muscle: O, I, N, F
O: Styloid process
I: Sides of the tongue
N: Hypoglossal nerve
F: draws tongue upward and backward (retraction)
253
Stylohyoid Muscle: O, I, N, F
O: Styloid process
I: body of hyoid bone
N: Facial nerve
F: Elevates hyoid bone and tongue
254
Name the salivary glands
Submandibular
Parotid
Sublingual
255
What muscle does the submandibular wrap around?
Mylohyoid muscle
256
Name the two parts of the submandibular gland. Where does each lie?
Superficial Part: within submandibular triangle and in submandibular fossa
Deep part: small and lies superior to mylohyoid muscle
257
How long is the submandibular duct? Where does it open? Where is it located?
5 cm
- Oral cavity of the sublingual caruncle
- - lateral to the frenulum of the tongue
258
What innervates the submandibular gland?
Parasympathetic fibers from the facial nerve (CN VII) via the submandibular ganglion
259
Smallest of the three salivary glands
Sublingual gland
260
Where does the sublingual gland lie?
Lies superior to the mylohyoid muscle, in the sublingual fossa
261
Where does the sublingual gland empty?
Floor of mouth by 12 short ducts, located along sublingual fold
262
What innervates the sublingual gland?
Parasympathetic fibers from the facial nerve (CN VII) via the submandibular ganglion
263
All intrinsic muscles of the tongue are innervated by which nerve?
Hypoglossal nerve
264
Name the extrinsic muscles of the tongue. Which nerve is each innervated by?
Genioglossus - hypoglossal
Hyoglossus - hypoglossal
Styloglossus - hypoglossal
Palatoglossus - vagus
265
Palatoglossus: O, I, N, F
O: soft palate
I: sides of the tongue
N: vagus nerve via the pharyngeal plexus
F: elevates back of tongue
266
Name the appropriate nerve that innervates the general sensation and taste.
General sensation: lingual nerve, a branch of the mandibular division of the trigeminal (CN V)
Taste: chorda tympani, a branch of the facial nerve (CN VII)
267
Which nerve innervates the general sensation and taste of the posterior one-third tongue?
Glossopharyngeal nerve (CN IX), which also innervates the vallate papillae
268
What allows the gag reflex?
Taste fibers from glossopharyngeal nerve (CN IX) that cross the sulcus terminalis to innervate the vallate papillae which allows the gag reflex in response to bitter tastes
269
Blood supply to the tongue
```
Lingual artery (from external carotid)
Lingual vein (to internal jugular)
```
270
What is the function of the teeth?
Break down food material during mastication, in order to increase its surface area to facilitate enzymatic activity and absorption
271
Name the structures of the teeth
Enamel: hardest substance of human body; covers the crown
Dentin: internal to enamel; makes up most of the tooth
Pulp: fills the central cavity of the tooth; contains blood vessels, nerves, and lymphatics
Cementum: bone-like substance which covers root (part of periodontium)
272
Name the parts of the teeth
Crown: covered by enamel and projects above gums
Neck: junction btw crown and root
Root: embedded in the alveolar processes of the maxilla and mandible; covered with cementum
273
Specialized oral mucosa which surrounds the teeth and covers adjacent alveolar bone
Gingivae
274
Name the types of teeth. Describe each.
Incisors: Single rooted chisel-shaped teether which are used for cutting (front four teeth)
Canines: Single rooted, pointed teeth which are used for puncturing and tearing
Premolars: Single or double rooted teeth with broad chewing surfaces which are used for grinding
Molars: multiple rooted teeth (better anchoring) with very broad chewing surfaces which are used for grinding
275
Name the surfaces of the teeth.
```
Labial surface
Lingual surface
Mesial surface
Distal surface
Occlusal surface
```
276
Describe the labial surface
Side facing the lip or buccal surface (contains incisors and canines)
Side facing the cheek (premolars and molars only)
277
Describe the lingual surface
Side facing the tongue
278
Describe the distal surface
Side facing posteriorly or away from the midline
279
Describe the occlusal surface
The chewing surface
280
Two incisors, one canine, and two molars in each quadrant, for a total of 20
Deciduous teeth
| Replaced by adult premolars
281
Two incisors, one canine, two premolars, and three molars in each quadrant, for a total of 32
Permanent teeth
282
Maxillary teeth innervation
Superior alveolar branches from the maxillary division of the trigeminal (CN V)
283
Mandibular teeth innervation
Inferior alveolar nerve from the mandibular division of the trigeminal
284
Shooting toothaches are common with this condition
Trigeminal Neuralgia
285
Common pathway for food and air; funnel-shaped fibromuscular tube, extending from the base of the skull to the inferior border of the cricoid cartilage, considered both a part of the digestive and respiratory pathways
Pharynx
286
The pharynx lies where?
Posterior to the nasal cavity, oral cavity, and larynx
287
The three parts of the pharynx
Nasopharynx: posterior to the nasal cavity "C1"
Oropharynx: posterior to the oral cavity "C2/C3"
Laryngopharynx: posterior to the larynx
288
Communicates with the nasal cavity through the choanae and with the oropharynx through the pharyngeal isthmus
Nasopharynx
289
Boundaries of the nasopharynx
Superior boundary: the roof of the nasopharynx
Inferior boundary: the soft palate
Anterior boundary: the posterior border of the inferior nasal concha
Posterior boundary: the posterior wall of the pharynx
290
The pharyngeal tonsils are embedded where?
Posterior wall of the nasopharynx
291
Another name for the pharyngeal tonsils
Adenoids
292
May become enlarged, causing difficulty breathing through the nose; second most commonly removed tonsil
Pharyngeal tonsils
293
Most commonly removed tonsils
Palatine tonsils
294
The pharyngotympanic (auditory) tube is limited above by this cartilaginous structure
Torus tubarius
295
Connects the nasopharynx with the middle ear and equalizes pressure between the nasopharynx and the tympanic cavity
Pharyngotympanic (auditory) tube
296
This infection can spread from the nasopharynx to the middle ear via the pharyngotympanic tube
Otitis media
297
Small tonsil which lies immediately behind the opening of the pharyngotympanic tube
Tubal Tonsil
298
Fold which descends from the torus tubarius to the wall fo the pharynx; deep to the fold is the salpingopharyngeus muscle
Salpingopharyngeal fold
299
Circular arrangement of the tonsils around the oropharynx that is the first line of defense in the salpingopharyngeal fold. What tonsils make it up?
Tonsillar ring
| - Lingual, palatine, tubal, and pharyngeal tonsils
300
What are the boundaries of the oropharynx?
Superior boundary: soft palate
Inferior boundary: superior border of the epiglottis
Anterior boundary: palatoglossal fold
Posterior boundary: posterior wall of the pharynx
301
Where does the oropharynx lie?
CV2 and CV 3
302
How does the oropharyx communicate with the oral cavity?
Through the oropharyngeal isthmus (isthmus of fauces)
303
The Palatine tonsils are found in what area of the pharynx?
Oropharynx
304
Folds of the oropharynx
Palatoglossal fold: from the soft palate to the tongue; deep to the fold is the palatoglossus muscle
Palatopharyngeal fold: from the soft palate to the wall of the pharynx; deep to the fold is the palatopharyngeus muscle
305
What is the space between the palatoglossal and palatopharyngeal folds called?
Tonsillar fossa
306
Longest part of the pharynx
Laryngopharynx
307
Boundaries of the laryngopharynx
Superior boundary: superior border of epiglottis
Inferior boundary: lower border of the cricoid cartilage where it joins the esophagus
Anterior boundary: posterior surface of larynx
Posterior boundary: posterior wall of the pharynx
308
Opening into the larynx and is found within the laryngopharynx
Laryngeal inlet
309
What binds the laryngopharynx?
Laterally, the aryepiglottic folds
| Inferiorly, the interarytenoid notch
310
A recess in the anterior wall of the laryngopharynx located on either side of the laryngeal inlet. Deep pisiform fossa may be responsible for what? (Hint: place where food can easily get lodged)
```
Piriform Fossa (recess)
- Halitoses (bad breath)
```
311
Name the muscles of the pharynx
```
External (Circular) layers of muscle
- Inferior constrictor muscle
- Middle constrictor muscle
- Superior constrictor muscle
Longitudinal layers of muscles
- Stylopharyngeus muscle
- Palatopharyngeus muscle
- Salpingopharyngeus muscle
```
312
Inferior constrictor muscle: O, I, N, F
O: cricoid cartilage and thyroid cartilage
I: pharyngeal raphe
N: Vagus nerve (CN X) via the pharyngeal plexus and external laryngeal plexus
F: contracts the pharynx during swallowing
313
Middle constrictor muscle: O, I, N, F
O: the greater and lesser horns of the hyoid bone
I: pharyngeal raphe
N: Vagus nerve (CN X) via the pharyngeal plexus
F: contracts the pharynx during swallowing
314
Superior Constrictor Muscle: O, I, N, F
Origin: medial pterygoid plate, alveolar part of mandible, side of tongue
I: pharyngeal raphe
N: Vagus nerve (CN X) via the pharyngeal plexus
F: contracts the pharynx during swallowing
315
Specialized band of muscles formed by the superior constrictor which helps to seal the pharyngeal isthmus during swallowing
Palatopharyngeal sphincter
316
Stylopharyngeus muscle: O, I, N, F
O: styloid process
I: thyroid cartilage, some fibers blend with those of the constrictors
N: glossopharyngeal nerve (CN IX)
F: elevates pharynx
317
Palatopharyngeus muscle: O, I, N, F
O: soft palate
I: wall of pharynx, thyroid cartilage
N: Vagus nerve (CN X) via the pharyngeal plexus
F: elevates the pharynx, narrows oropharynx
318
Salpingopharyngeus muscle: O, I, N, F
O: torus tubarius and opening of the pharyngotympanic tube
I: Wall of pharynx
N: Vagus nerve (CN X) via the pharyngeal plexus
F: Elevates the pharynx, opens pharyngotympanic tube
319
Which muscles of the pharynx blend in together?
Palatopharyngeus muscle and salpingopharyngeus muscle
320
What is the control center for swallowing in the pharynx? Where does it lie?
Pharyngeal plexus
| - On the middle constrictor
321
Name the nerves of the pharynx. What does each innervate?
- Pharyngeal branch of the vagus (CN X): motor fibers originate from cranial part of accessory nerve and innervates all pharynx muscles MINUS stylopharyngeus (innervated by glossopharyngeal)
- Pharyngeal branch of the glossopharyngeal (CN IX): sensory to the mucosa of pharynx
- Sympathetic fibers from the superior cervical ganglion
322
What are the arteries of the pharynx?
Ascending pharyngeal artery
| Maxillary artery
323
Fascia and spaces of the pharynx from DEEPEST to most SUPERFICIAL.
Mucosa of pharynx --> Pharyngobasilar fascia --> constrictor muscle --> Buccopharyngeal fascia
324
Layer of fascia which surrounds the pharynx external to the muscles of the pharynx; continuous with the pretracheal fascia below; allows infection to spread from pharynx to mediastinum
Buccopharyngeal fascia
325
A layer of fascia which lies internal to the muscles and external to the mucosa of the pharynx
Pharyngobasilar fascia
326
A potential space between the buccopharyngeal fascia (or pretracheal fascia) and the prevertebral fascia. Extends downward into the thorax and permits free movement of the pharynx and esophagus during swallowing
Retropharyngeal space
327
Why is the retropharyngeal space significant?
Hemorrhage from cervical trauma or abscess from pharyngeal infection into the retropharyngeal space may cause the posterior wall of the pharynx to balloon forward, potentially leading to suffocation
Radiology: look for widening of retropharyngeal space in cases of cervical trauma a pharyngeal abscess
328
What is another term for swallowing?
Deglutition
329
Explaining the various steps of swallowing
1) Tongue moves bolus into oropharyngeal isthmus
2. ) (a) Palatoglossus and palatopharyngeus muscles squeeze bolus into oropharynx while (b) levator veli palantini and tensor veli palatini muscles elevate the soft palate to close off the pharyngeal isthmus
3. ) (a) Stylopharyngeus, palatopharyngeus, and salpingopharyngeus elevate the walls of the pharynx while (b) suprahyoid muscles elevate the hyoid bone and the larynx under the bulge of the tongue, which flexes the epiglottis back over the laryngeal inlet
4. ) Superior, middle, and inferior constrictor muscles contract in sequence, to move the food through the oropharynx and laryngopharynx and into the esophagus... peristalsis then propels it downward to the stomach
330
Condition where it is difficult to swallow
Dysphagia
331
Describe the first step to swallowing
Tongue moves bolus into oropharyngeal isthmus
332
Describe second step of swallowing
Palatoglossus and Palatopharyngeus muscles squeeze bolus back into the oropharynx
Levator veli palatini and tensor veli palatini muscles elevate soft palate
333
Describe third step of swallowing
Stylopharyngeus, palatopharyngeus and salpingopharyngeus elevate the walls of the pharynx
Suprahyoid muslces elevate the hoid bone and larynx under the bulge of the tongue, which flexes the epiglottis back over the laryngeal inlet
334
Describe the fourth step of swallowing
Superior, middle, and inferior constrictor muscles move food through oropharynx and laryngopharynx and into the esophagus
Peristalsis propels food down esophagus to the stomach
