Muscles Of Mastication

Question 1

What’s the origin of temporalis muscle?

Answer 1

It originates from the temporal fossa, temporal fascia and the inferior temporal line.

Question 2

What’s the insertion of temporalis muscle?

Answer 2

It inserts on the coronoid process and the anterior border of ramus of the mandible.

Question 3

What’s the action of temporalis?

Answer 3

Anterior fibers elevate the mandible and posterior fibers retract it.

Question 4

What’s the origin of masseter muscle?

Answer 4

Superficial fibers from the lower border of zygomatic arch and deep fibers from deep surface of zygomatic arch.

Question 5

What’s the insertion of masseter?

Answer 5

It inserts on the lateral surface of the ramus of the mandible.

Question 6

What’s the action of masseter?

Answer 6

Elevation by deep fibers

and protrusion by superficial fibers

Question 7

What’s the origin of the lateral pterygoid?

Answer 7

Upper part from the infra temporal surface and crest of the GW of sphenoid
Lower part from the lateral surface of the lateral pterygoid surface plate.

Question 8

Where do the two heads of lateral pterygoid insert?

Answer 8

They insert on the pterygoid fovea, articular disc and capsule of TMJ

Question 9

Mention the origin and insertion of medial pterygoid

Answer 9

From maxillary tuberosity and medial surface of the lateral pterygoid plate and inserts on the medial surface of the ramus of the mandible.

Question 10

All muscles of mastication are supplied by….. except the medial pterygoid which is supplied by….

Answer 10

Anterior division of mandibular nerve

Mandibular trunk itself (n. to medial pterygoid)