Muscles Of Mastication

Question 1

Masseter origin, insertion, and action?

Answer 1

O: Zygomatic arch

I: Lateral ramus, angle, lower border of mandible

A: Closes mouth

Question 2

Temporalis origin, insertion, and action?

Answer 2

O: Temporalis fossa

I: Anterior border or coronoid process of ramus

A: Anterior fibers close mandible; Posterior fibers retract the mandible.

Question 3

Medial Pterygoid origin, insertion, and action.

Answer 3

O: Pterygoid fossa on medial surface of lateral pterygoid plate

I: Medial surface of mandible above angle

A: Closes mandible

Question 4

Lateral Pterygoid upper head origin, insertion, and action?

Answer 4

O: greater wing of sphenoid below temporal

I: Neck of condylar process & capsular disc

A: lateral movement or open mandible

Question 5

Lateral pterygoid lower head origin, insertion, and action?

Answer 5

O: lateral side of lateral Pterygoid plate on sphenoid

I: anterior neck of condylar process

A: lateral movement or opens mandible

Question 6

Supra and infrahyoids do what to the mandible?

Answer 6

Help open it