MOINA of Mastication

Question 1

masseter

Answer 1

origin: zygomatic arch of temporalis
insertion: angle of mandible

nerve: trigeminal nerve (V3) - mandibular branch

closes (elevates) jaw

Question 2

medial/interior pterygoid

Answer 2

origin: medial surface of lateral pterygoid plate
insertion: medial aspect of angle of mandible

nerve: trigeminal nerve (V3) - mandibular branch

closes (elevates) jaw

Question 3

temporalis

Answer 3

origin: temporal fossa of temporalis and sphenoid
insertion: coranoid process of mandible

nerve: trigeminal nerve (V3) - mandibular branch

anterior fibers close (elevates jaw); medial and lateral fibers retract mandible (opens jaw)

Question 4

lateral/exterior pterygoid

Answer 4

origin: greater wing of sphenoid (superior head); lateral pterygoid plate (lateral head)
insertion: joint capsule of condylar process

nerve: trigeminal nerve (V3) - mandibular process

protrusion of jaw (only muscle of masticators to protrude the jaw)