10- Muscles Of Mastication

Question 0

Temporalis

Answer 0

Fan shaped, covers part of the temporal, frontal, and parietal bones.

Closes jaw, elevates and retracts mandible. Maintains position of mandible at rest.

Question 1

Masseter

Answer 1

Covers lateral aspect of mandibular ramus.

Prime mover of jaw closure. Elevates mandible.

Question 2

Medial pterygoid

Answer 2

Two headed muscle runs along internal surface of mandible and is largely concealed by that bone.

Synergist of temporalis and masseter muscles in elevation of the mandible. Acts with lateral pterygoid muscle to protrude mandible. Promotes grinding movement.

Question 3

Lateral pterygoid

Answer 3

Deep, two headed, superior to medial pterygoid muscle.

Protrudes mandible. Provides forward sliding and side to side grinding movements of the lower teeth.

Question 4

Buccinator

Answer 4

Trampoline like action . Keeps food between grinding surfaces of teeth during chewing.