Muscles of Mastication

Question 1

Temporalis - Origin

Answer 1

Temporal fossa

Question 2

Temporalis - Insertion

Answer 2

Coronoid process and ramus of mandible

Question 3

Temporalis - Action

Answer 3

Elevate and retrude mandible

Question 4

Masseter - Origin

Answer 4

Superficial head - Ant 2/3 of zygomatic arch

Deep head - inner aspect of zygomatic arch and inner bord of post 1/3

Question 5

Masseter - Insertion

Answer 5

Lateral surface of ramus and angle of mandible

Question 6

Masseter - Action

Answer 6

Elevate and protrude mandible

Retrude (when in protruded state)

Question 7

Lateral pterygoid muscle - Origin

Answer 7

Superior head: roof of infratemporal fossa - greater wing of sphenoid
Inferior head: Lateral surface of lateral pterygoid plate

Question 8

Lateral pterygoid muscle - Insertion

Answer 8

Superior: Pterygoid fovea, TMJ capsule and disk
Inferior: Pterygoid fovea

Question 9

Lateral pterygoid muscle - Action

Answer 9

Acting alone: move mandible to opposite side

Acting together: protrude mandible, pulls articular disk forward, depress

Question 10

Medial pterygoid - Origin

Answer 10

Lateral pterygoid plate and maxillary tuberosity

Question 11

Medial pterygoid - Insertion

Answer 11

Ramus of mandible

Question 12

Medial pterygoid - Action

Answer 12

Elevate and protrude mandible

Question 13

Buccinator - origin

Answer 13

Pterygomandibular raphae and buccal alveolar process of mandible and maxilla

Question 14

Buccinator - insertion

Answer 14

Orbicular oris fibers

Question 15

Buccinator - Action

Answer 15

Compress cheeks to push food onto teeth

Question 16

Buccinator - innervation

Answer 16

CN VII