Infratemporal Fossa and TMJ Flashcards
What are the boundaries of the Infratemporal Fossa?
Lateral: ramus of mandible anterior: maxilla medial: lateral pterygoid plate roof: sphenoid (greater wing) poster posterior: tympanic plate and mastoid and styloid processes inferior: angle of mandible
What branches of the maxillary A are in the pterygoid part?
Deep temporal As
pterygoid branches
masseteric A
Buccal A
What nerve supplies the anterior 2/3 of the tongue?
lingual N = branch of V3
What nerve innervates tensor tympani and tensor veli palatini Ms?
V3
What is the communicating branch to the lacrimal N?
branch off of zygomatic n (V2) to lacrimal N (V1)
What are the main branches of the infraorbital N?
*from V2* external nasal n superior labial n anterior superior alveolar n middle superior labial n
What does the posterior superior alveolar n come off of ?
infraorbital N (V2)
How can the maxillary A run in relation to the lateral pterygoid m?
can run lateral or medial to the muscle
What are the 4 paired muscles of mastication?
temporalis
masseter
lateral pterygoid
medial pterigoid
What innervates the muscles of mastication?
CN V3 = mandibular n
What is the action of the masseter m?
elevates mandible
superficial head protracts
deep head retracts mandible
What are the actions of the Temporalis m?
vertical fibers: elevate mandible
horizontal fibers: retract mandible
unilateral: lateral mvt
What do the suprahyoid muscles do?
when you stabilize the hyoid bone –> depress mandible/open mouth
if hyoid not stabilized –> raise palate and draws hyoid fwd during swallowing
What ms depress the mandible?
lateral pterygoids
suprahyoid and infrahyoid ms
What elevates the mandible?
temporalis
massiter
medial pterygoids
What protrudes the mandible?
lateral pterygoids
masseter
medial pterygoids
What muscles draw back the mandible?
temporalis
masseter
What muscles do lateral movements of the mandible?
ipsilateral temporalis and masseter
contralateral pterygoids
What are the 3 ligaments to know of the temperomandibular joint?
lateral L
stylomandibular L
sphenomandibular L
What is the postglenoid tubercle?
anterior to TMJ - prevents too much anterior motion of the mandible
What is the articular tubercle of the TMJ?
posterior of joint - prevents posterior motion of mandible
What are the bands of the articular disc?
thickenings of the articular disc that keep the mandible in place
How does the TMJ move?
hinge joint until 15 degrees –> then head of mandible is dislocated anteriorly
What is the innervation of the TMJ?
V3: auriculotemporal n, posterior deep temporal n, masseteric n
