Deep Face & Infratemporal Fossa

Question 1

What is the origin of the masseter M.?

Answer 1

zygomatic arch

Question 2

What is the insertion of the masseter M.?

Answer 2

lateral ramus of the mandible

Question 3

What is the action of the masseter M.?

Answer 3

elevate and protrude mandible

Question 4

What is the innervation of the masseter M.?

Answer 4

masseteric N. (branch of V3)

Question 5

What is the origin of the temporalis M.?

Answer 5

floor of temporal fossa

Question 6

What is the insertion of the temporalis M.?

Answer 6

coronoid process and ramus of mandible

Question 7

What is the action of the temporalis M.?

Answer 7

elevate mandible

Question 8

What is the innervation of the temporalis M.?

Answer 8

deep temporal N.

Question 9

What is the origin of the lateral pterygoid M.?

Answer 9

greater wing and lateral pterygoid plate of sphenoid

Question 10

What is the insertion of the lateral pterygoid M.?

Answer 10

neck of the mandible

articular disc of TMJ

Question 11

What is the action of the lateral pterygoid M.?

Answer 11

protrude mandible and side-to-side mvmt

Question 12

What is the innervation of the lateral pterygoid M.?

Answer 12

lateral pterygoid N.

Question 13

What is the origin of the medial pterygoid M.?

Answer 13

maxilla, pterygoid plate and palatine bone

Question 14

What is the insertion of the medial pterygoid M.?

Answer 14

medial surface of ramus of mandible

Question 15

What is the action of the medial pterygoid M.?

Answer 15

elevate mandible and produce grinding motion

Question 16

What is the innervation of the medial pterygoid M.?

Answer 16

medial pterygoid N.

Question 17

What is the origin of the buccinator M.?

Answer 17

alveolar process of maxilla and mandible

Question 18

What is the insertion of the buccinator M.?

Answer 18

angle of the mouth

Question 19

What is the action of the buccinator M.?

Answer 19

keeps cheek taut during chewing

Question 20

What is the innervation of the buccinator M.?

Answer 20

branch of mandibular N. (V3 of CN V)

Question 21

What innervates the TMJ?

Answer 21

masseteric N.
auriculotemporal N.
posterior deep temporal N.

Question 22

In what direction does a TMJ dislocation occur?

Answer 22

anteriorly

-condylar process and head of mandible slip out of mandibular fossa

Question 23

What are the boundaries of the infratemporal fossa?

Answer 23

lateral - ramus of the mandible
anterior - maxilla
medial - lateral pterygoid plate
roof - greater wing of the sphenoid
posterior - tympanic plate, mastoid process
inferior - angle of the mandible

Question 24

What are some major contents of the infratemporal fossa?

Answer 24

lateral and medial pterygoid mm.
inferior alveolar N.
lingual N.
buccal N.
chorda tympani
otic ganglion
maxillary A.