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NEURO 375 > CN V and VII > Flashcards

CN V and VII Flashcards

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1
Q

What are the divisions of CN V, trigeminal?

A

V1 - opthalamic
V2 - maxillary
V3 - mandibular

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2
Q

Through which bone cavity does V1 of CN V, trigeminal, exit the cranial cavity?

A

superior orbital fissure

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3
Q

Through which bone cavity does V2 of CN V, trigeminal, exit the cranial cavity?

A

foramen rotundum

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4
Q

Through which bone cavity does V3 of CN V, trigeminal, exit the cranial cavity?

A

foramen ovale

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5
Q

What are the main functions of CN V, trigeminal?

A
  • sensory: transmission of tactile, proprioception, pain/temp info from the head (e.g. DC and STT of head)
  • motor: controls muscles of mastication
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6
Q

What is the V1 nerve and what is it responsible for? Is it motor or sensory?

A
  • opthalamic nerve
  • pure sensory
  • eye and forehead
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7
Q

What is the V2 nerve and what is it responsible for? Is it motor or sensory?

A
  • maxillary nerve
  • pure sensory
  • cheek and upper teeth
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8
Q

What is the V3 nerve and what is it responsible for? Is it motor or sensory?

A
  • mandibular nerve
  • sensory: mandible and lower teeth
  • motor: muscles of mastication
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9
Q

Which division of CN V, trigeminal, has a motor component?

A

V3, mandibular nerve

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10
Q

How many ganglia are in the trigeminal ganglion?

A

3

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11
Q

Which branch of V1 innervates the skin to the forehead and scalp?

A

supraorbital nerve

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12
Q

What does V1 innervate?

A
  • skin to forehead and scalp
  • upper eyelid, tip of the nose
  • cornea and nasal cavity
  • paranasal air sinuses
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13
Q

What does V2 innervate?

A
  • maxillary air sinus
  • nasal cavity
  • lower eyelid, skin of cheek, upper lip
  • maxillary (upper) teeth and gum
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14
Q

Which branch of V2 innervates the nasal cavity and maxillary air sinus?

A

infraorbital branch

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15
Q

TRUE or FALSE: V1 is a mixed nerve.

A

FALSE –> V3 is a mixed nerve (sensory and motor)

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16
Q

Which branch of the trigeminal nerve (CN V) is the largest?

A

V3

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17
Q

What does the sensory component of V3 innervate?

A
  • lower lip, skin of mandible, chin
  • mandibular teeth and gums
  • anterior 2/3 tongue
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18
Q

Which branch of V3 innervates sensation to the mandibular teeth and gums?

A

inferior alveolar nerve

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19
Q

Which branch of V3 innervates sensation to the anterior 2/3 tongue?

A

lingual nerve

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20
Q

Is the sensory trigeminothalamic tract contralateral or ipsilateral?

A

contralateral

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21
Q

What are the 3 sensory trigeminal subnuclei? Where are they found?

A
  1. spinal nucleus, 2. chief/main nucleus, 3. mesencephalic nucleus
  • found in the brainstem
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22
Q

Where are the synapses in the pain and temperature pathway for the trigeminothalamic tract?

A
  1. spinal nucleus
  2. ventral posteriomedial nucleus (VPM) of the thalamus
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23
Q

In comparison with the spinothalamic tract, where does pain/temperature info enter the CNS in the trigeminothalamic tract?

Study These Flashcards
A

spinothalamic tract: substantia gelatinosa in the dorsal horn of the SPINAL CORD
trigeminothalamic tract: MEDULLA

24
Q

Where are the synapses in the light touch and pressure pathway for the trigeminothalamic tract?

Study These Flashcards
A
  1. chief/main nucleus
  2. VPM nucleus in thalamus
25
In comparison with the dorsal columns medial lemniscal tract, where does light touch and pressure info enter the CNS in the trigeminothalamic tract?
dorsal columns medial lemniscal tract: cuneate and gracile fasciculi in SPINAL CORD trigeminothalamic tract: PONS
26
Where are the synapses in the proprioception pathway for the trigeminothalamic tract?
1. mesencephalic nucleus 2. VPM in the thalamus
27
Proprioceptive info from which muscles are sent to the brainstem in the V3 tract?
muscles of mastication
28
Which nucleus in the brainstem acts on motor action of the trigeminal nerve? which division of the trigeminal tract synapses here?
- motor nucleus of V - V3
29
What nerve extends from the motor nucleus of V to the muscles of mastication?
mandibular nerve
30
TRUE or FALSE: the motor fibres of the trigeminal nerve go through the trigeminal nucleus.
FALSE
31
What are the muscles of mastication?
1. masseter muscle 2. temporalis muscle
32
All upper motor neurons, except _________________, form the corticobulbar tracts (of CN V). They act on ___________ lower motor neurons.
1. lower facial nucleus 2. bilateral
33
The lower facial nucleus acts on _____________ lower motor neurons.
contralateral
34
Through which bone cavity does CN VII, facial, exit the cranial cavity?
internal acoustic meatus
35
TRUE or FALSE: CN VII, facial nerve, is only sensory and motor.
FALSE --> mixed nerve: sensory, motor, PARASYMPATHETIC
36
What does the motor component of CN VII, facial, innervate?
- muscles of facial expression - stapedius muscle
37
What does the sensory component of CN VII, facial, innervate?
taste to anterior 2/3 tongue (via chorda tympani)
38
What does the parasympathetic component of CN VII, facial, innervate?
-lacrimal gland - sublingual and submandibular salivary glands
39
What are the branches to the muscles of facial expression?
1. temporal 2. zygomatic 3. buccal 4. marginal mandibular 5. cervical
40
Through which bone cavity does CN VII, facial, exit the cranial cavity?
Internal Acoustic Meatus
41
Which cranial nerves are involved in the corneal reflex? Describe the corneal reflex.
- CN V, trigeminal: afferent arc (sensory) - CN VII, facial: efferent arc (motor) via innervation of orbicularis oculi - reflex: consensual blinking of both eyes in response to stimulation of one eye
42
Which muscle does CN VII, facial, innervate in the corneal reflex?
orbicularis oculi
43
Which cranial nerve innervates the stapedius muscle?
CN VII, facial
44
List the facial nerve nuclei and their functions.
- facial motor nucleus --> motor - superior salivary nucleus --> PNS - nucleus of solitary tract (NTS) --> taste
45
Is the motor component of CN VII, facial, to the upper face contralateral, ipsilateral, or both?
upper face = contralateral and ipsilateral
46
Is the motor component of CN VII, facial, to the lower face contralateral, ipsilateral, or both?
lower face = contralateral
47
What condition might arise if there is damage to the facial nerve? What are the symptoms?
facial nerve palsy - weakness or paralysis on one side of the face
48
What is the name of the facial nerve palsy that is idiopathic in origin?
Bell's palsy
49
what part of the face would be paralyzed if there is a right upper motor neuron lesion in the facial nerve?
contralateral (left) lower 2/3 face
50
What part of the face would be paralyzed if there is a left lower motor neuron lesion in the facial nerve?
ipsilateral (left) half of face
51
Which branch of the facial nerve is responsible for taste?
chorda tympani
52
Describe the taste pathway of the facial nerve.
facial nerve --> geniculate ganglion --> chorda tympani
53
Which nucleus in the brainstem does the synapse occur for the facial nerve component of taste?
nucleus solitary tract (NTS)
54
salivation is innervated by which 2 cranial nerves? Which one is preganglionic? postganglionic?
CN VII, facial = preganglionic CN V, trigeminal = postganglionic
55
Which division of CN V is the lacrimal nerve?
V1
56
What are the 4 cranial nerves with parasympathetic innervation?
- CN III, oculomotor - CN V, facial - CN IX, glossopharyngeal - CN X, vagus

NEURO 375 (19 decks)

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