Deep face, Infratemporal Fossa, TMJ Flashcards
Muscles of Mastication
Temporalis M
Masseter M
Lateral pterygoid M
Medial pterygoid M
Temporalis M
CN V3
temporal fossa–> coronoid and anterior ramus of mandible
elevate mandible, retract mandible
Masseter M
CN V3
zygomatic arch/bone–> anterior and lateral mandible ramus
elevate mandible, minor protrusion
Lateral Pterygoid M
CN V3
sphenoid and plate–> TMJ
PROTRUSION, depress mandible, swing jaw during mastication
Medial Pterygoid M
CN V3
medial side of lateral pterygoid plate, palatine, maxilla–> medial ramus of mandible
elevate mandible with masseter M, minor protrusion, small grinding movements
Relationship b/t lateral pterygoid M to TMJ
It attaches to the TMJ
Protrudes mandible during
Helps gravity depress mandible (open mouth)
Unilateral: mastication with medial pterygoid
Nerves near TMJ
Facial N (CN VII) runs over it
Auriculotemporal N exits through posterior joint capsule
Describe positional shift of structures of TMJ in dislocation
Articular disc pushed anteriorly d/t yawning or hit in cheek
Mandible remains open and depressed
NOT common posterior dislocation d/t strong lateral ligament
Facial nerve over TMJ and auriculotemporal N (CN V3) exits posterior part of joint
—> injury to these cause laxity and instability of TMJ
Temporal Fossa
Indentation over temporal bone where temporalis M sits
—>above zygomatic arch
Pterion borders
Temporal, Sphenoid, Frontal, Parietal
What nerves can be damaged in TMJ and what is the outcome?
Facial N (CN VII)
Auriculotemporal N (CN V3)
Increased laxity and instability of TMJ
What nerves can be damaged in TMJ and what is the outcome?
Facial N (CN VII)
Auriculotemporal N (CN V3)
Increased laxity and instability of TMJ
What is the innervation of TMJ?
Branches of CN V3:
Auriculotemporal N
Posterior deep temporal N
Masseteric N
