Muscles of Mastication

Question 1

What is the innervation of ALL the muscles of mastication?

Answer 1

branches of the mandibular division of the trigeminal nerve (V3)

(mandibular n. V3)

Question 2

masseter attachments

Answer 2

zygomatic arch to the angle of the mandible and lateral aspect of the ramus

Question 3

function of the masseter:

Answer 3

elevation, protraction, and retraction (deep fibers) of the mandible

Question 4

temporalis muscle attachments

Answer 4

**specifically innervated by deep temporal n. of mandibular nerve (V3)

from the temporal fossa to the coronoid process and anterior border of the ramus of the mandible

Question 5

temporalis function

Answer 5

elevation and retraction (posterior aspect of the muscle) of the mandible

Question 6

lateral pterygoid muscle attachments

Answer 6

(superior head) from the infra temporal surface of the sphenoid and (inferior head) lateral surface of the lateral pterygoid plate (sphenoid bone)—-> neck of the mandible and the TMJ articular disc

• DEEP TO THE TEMPORALIS AND THE MASSETER

Question 7

lateral pterygoid function:

Answer 7

depresses mandible, protracts & acts with the ipsilateral medial pterygoid to rotate the mandible to produce the side-to-side movements during chewing

** R pterygoids move the mandible laterally to the LEFT (contralateral side)

Question 8

medial pterygoid attachments:

Answer 8

from the medial surface of the lateral pterygoid plate & adjacent maxilla to the medial aspect of the angle of the mandible

Question 9

medial pterygoid function:

Answer 9

elevation of the mandible & acts with the ipsilateral lateral pterygoid to rotate the mandible to produce the side-to-side movements during trituration of food