Muscles Of Mastication

Question 1

Masseter

Answer 1

ORIGIN: maxillary process of zygomatic (superficial part) and zygomatic arch (deep part).

INSERT: ramus of mandible.

ACTION: elevate mandible.

NERVE: mandibular nerve.

Question 2

Temporalis

Answer 2

ORIGIN: temporal fossa.

INSERT: coronoid process of mandible.

ACTION: elevate and retract mandible.

NERVE: mandibular nerve.

Question 3

Medial pterygoid

Answer 3

ORIGIN: maxilla (superficial head) and lateral pterygoid plate of sphenoid (deep head).

INSERT: ramus of mandible.

ACTION: elevate mandible.

NERVE: mandibular nerve.

Question 4

Lateral pterygoid

Answer 4

ORIGIN: greater wing of sphenoid (superior head) and lateral pterygoid plate of sphenoid (inferior head).

INSERT: neck of mandible.

ACTION: protract mandible, and allow side-to-side jaw action.

NERVE: mandibular nerve.