Flashcards in Week 2 - Wet Room Deck (52):
How many permanent Incisor, canine, premolar and molar teeth are there?
Incisor = 8
Canine = 4
Premolar = 8
Molar = 12
How many deciduous incisor, canine and molar teeth are there?
Incisor = 8
Canine = 4
molar = 8
What type of joint is the temporomandibular joint (TMJ)?
Hinge synovial joint
Which 2 articular processes form the TMJ?
Mandibular fossa of the temporal bone
Condylar process of the mandible
What movements of the mandible occur at the TMJ?
Elevation (close mouth)
Depression (open mouth)
Retrusion (reduced chin)
Side to side movements
Explain what the muscles of mastication are?
(don't name them)
The muscles of mastication refer to a group of four muscles which act on the TMJ during mastication
Name the muscles of mastication
What is the temporalis muscle?
This is a large fan shaped muscle on the side of the head
What are the bony attachments of the temporals muscle?
(Floor of the) temporal fossa
(Tip and medial surface of the) coronoid process
How do the anterior fibres of the temporalis differ from the posterior fibres of the temporalis?
Anterior fibres = nearly vertical (elevation)
Posterior fibres = nearly horizontal (retrusion)
What are the bony attachments of the masseter?
Outer surface of the ramus and angle of the mandible
What part of the skull to the lateral and medial pterygoid muscles attach?
LATERAL pterygoid plate
What side of the pterygoid plate do the lateral and medial pterygoid muscles attach
Medial pterygoid muscle = medial side of lateral pterygoid plate
Lateral pterygoid muscle = lateral side of lateral pterygoid plate
Where in the mandible does the lateral pterygoid muscle attach?
Enters into the joint capsule of the TMJ to insert onto the neck of the mandible and also the articular disc of this joint
Where in the mandible does the medial pterygoid muscle attach?
medial surface of rams of mandible
What causes depression of the mandible if the muscles of mastication cause elevation?
Suprahyoid bones and gravity
What are the suprahyoid muscles that depress the mandible?
What muscle causes protrusion of the mandible?
Posterior fibres of the temporalis muscle
What muscle causes retraction of the mandible
Biilateral lateral pterygoid muscle
What muscle causes side to side movements of the jaw?
Unilateral lateral pterygoid muscle
What innervates the muscles of mastication?
Branches of the mandibular division of the trigeminal nerve.
This is the only division of the trigeminal nerve that carries both sensory and motor fibres
What does the maxillary nerve supply?
Cutaneous innervation to the cheek, upper lip, lower eyelid,
Mucous membranes of the: palate, teeth, gingiva, nasal cavity and maxiallary sinus
What does the ophthalmic nerve supply?
The skin of the forehead
Nasal mucous membranes and sinuses
Describe the path of the mandibular division of the trigeminal nerve
It emerges from the cranial cavity through the OVAL FORAMEN (bottom of sphenoid bone)
In the INFRATEMPORAL FOSSA, its motor branches supply the muscles of mastication
One of its sensory branches, the INFERIOR ALVEOLAR NERVE enters into the MANDIBULAR FORAMEN and provides sensory innervation to the mandibular area.
What is the first part of the respiratory tract?
what does the frontal process of the maxilla articulate with?
The nasal bones laterally
What forms the roof of the nose?
The nasal bones
Part of the frontal bone
Body of the sphenoid bone
The part of the ethmoid bone that contributes to the roof of the nasal cavity contains the what?
What forms the floor of the nasal cavity?
Palatine processes of the maxillae and the palatine bones which form the hard palate.
The floor of the nasal cavity is extended posteriorly by the soft palate
What two bones form the nasal septum?
What structure lies anterior to these and completes the nasal septum?
Perpendicular plate of the ethmoid
What passes through the cribriform plate?
What attaches to the crust gali?
What are some of the parts of the ethmoid bone?
The cribiform plate
The crista gali
The central plate
The superior and middle conchae
The ethmoid air cells
What two bones form the hard palate?
What kind of epithelium forms the respiratory mucosae which lines most of the nasal cavity?
Ciliated Pseudostratified Columnar Epithelium
The roof of the nasal cavity is lined by what?
What cranial nerve innervates the olfactory mucosa?
Olfactory nerve (Cr. N. I)
Which plate of bone lying on the roof of the cranial cavity do axons of the olfactory nerve pass through to enter into the cranial cavity?
What is the name given to the space above the superior concha?
What bone is the superior and middle conchae part of?
What bone if the inferior concha part of?
Superior and middle conchae = ethmoid
Inferior conchae = its own bone
What provides a rich arterial supply to the nose?
Branches of the ophthalmic artery (itself a branch of the ECA) and also branches of the ECA
What venous drainage does the nose have?
What sinus opens into the spheno-ethmoidal sinus?
What sinus opens into the superior meatus?
Posterior ethmoidal air cells
What opens into the middle meatus?
Anterior ethmoidal air cells
Middle ethmoidal air cells
What opens into the inferior meatus?
Which sinus' opening is not at its most inferior part and therefore secretions from this sinus do not drain well
Which sinus has its floor often indented by tooth sockets?
What branch of the facial nerve innervates frontal air sinus?
What branch of the facial nerve innervates the maxillary air sinus?
What branch of the facial nerve innervates the ethmoidal air cells?
V1 + V2