Infratemporal Fossa and Temperomandibular Joint

Question 1

What are the borders of the infratemporal fossa?

Answer 1

Lateral = ramus of mandible
Medial = lateral pterygoid plate
Anterior = maxilla
Posterior = mastoid/styloid process
Roof = greater wing of sphenoid
Inferior = angle of mandible

Question 2

How are the facial artery and vein arranged on the mandible?

Answer 2

Facial artery is more anterior/medial than facial vein

Question 3

The parotid gland is innervated by what nerve?

Answer 3

Glossopharyngeal nerve that goes through the otic ganglion

Question 4

What is the difference between what the buccal n innervates and the buccal branch of the facial nerve?

Answer 4

Buccal n - sensation inside of cheek/mouth

Buccal branch of facial n - buccinator m (muscle of facial expression)

Question 5

What could be injured due to a fracture of the neck of the mandible?

Answer 5

V3 or otic ganglion

Question 6

What could be injured due to a fracture of the ramus of the mandible?

Answer 6

Inferior alveolar n or inferior alveolar a

Question 7

What could be injured with a fracture of the corpus of the mandible?

Answer 7

Inferior alveolar n or inferior alveolar a

Question 8

Where does the maxillary artery run in relation to the lateral pterygoid m?

Answer 8

Lateral or medial to it

Question 9

What are the muscles of mastication?

Answer 9

Temporalis m, masseter m, lateral pterygoid m, medial pterygoid m.
Buccinator m = accessory muscle, becomes taut during chewing to keep food on top of molars
Orbicularis oris m = accessory muscle, keeps mouth closed during chewing

Question 10

What two muscles are on either side of the ramus of the mandible?

Answer 10

Medial pterygoid m and masseter m

Question 11

Actions of masseter m

Answer 11

Elevates mandible

Assists in protraction, retraction, and side-to-side

Question 12

Innervation of masseter m

Answer 12

Masseteric n

Question 13

Actions of temporalis m

Answer 13

Vertical fibers - elevate mandible
Horizontal fibers - retract mandible
Unilateral - lateral movement for chewing

Question 14

Innervation of temporalis m

Answer 14

Deep temporal n

Question 15

Actions of lateral pterygoid m

Answer 15

Bilateral - protrude mandible

Unilateral - side-to-side movement when coupled with ipsilateral medial pterygoid m

Question 16

Innervation of lateral pterygoid m

Answer 16

Lateral pterygoid n

Question 17

Actions of medial pterygoid m

Answer 17

Bilateral - elevation of mandible, protrusion of mandible with lateral pterygoid m
Unilateral - protrude and side-to-side when coupled with lateral pterygoid

Question 18

Innervation of medial pterygoid m

Answer 18

Medial pterygoid n

Question 19

What muscles assist in swallowing and opening the mandible?

Answer 19

Digastric m, geniohyoid m, mylohyoid m, stylohyoid m

Question 20

What muscles fix the hyoid bone so the mandible can open?

Answer 20

Sternohyoid m, sternothyroid m, thyrohyoid m, omohyoid m

Question 21

What ligaments are involved in the temporomandibular joint?

Answer 21

Lateral temporomandibular l, stylomandibular l, sphenomandibular l

Question 22

What muscle attaches to the articular disc of the temporomandibular joint?

Answer 22

The superior head of the lateral pterygoid m

Question 23

What innervates the temperomandibular joint?

Answer 23

Masseteric n, posterior deep temporal n, and auriculotemporal n