Muscles of Mastication

Question 1

Masseter

Answer 1

A: From zygomatic arch to the angle of the mandible & lateral aspect of the ramus
Fx: Elevation, protraction, and retraction (deep fibers) of the mandible

Question 2

Temporalis

Answer 2

A: From temporal fossa to the coronoid process & anterior border (temporal crest) of the ramus of the mandible
Fx: Elevation and retraction (posterior aspect of the muscle) of the mandible

Question 3

Lateral Ptyergoid

Answer 3

A: From infratermporal surface of the sphenoid & lateral surface of the lateral pterygoid plate to the pterygoid fovea of the mandible & the TMJ disc
Fx: Protraction of the mandible & acts with ipsilateral medial pterygoid to rotate mandible to produce side to side movements during trituration of food

Question 4

Medial Pterygoid

Answer 4

A: From the medial surface of the lateral pterygoid plate & adjacent ptyergoid fossa to the medial aspect of the angle of the mandible
Fx: Elevation of the mandible and acts with ipsilateral pterygoid to rotate the mandible and produce side to side movements during trituration of food