Anatomy - MOINA of Mastication

MITE muscles

origin of masseter

zygomatic arch of temporalis

insertion of masseter

angle of mandible

innervation of masseter

mandibular branch of trigeminal nerve (CN V3)

action of masseter

closes (elevates) the jaw

origin of medial/ internal pterygoid

medial surface of lateral pterygoid plate

insertion of medial/ internal pterygoid

medial aspect of the angle of the mandible

innervation of medial/ internal pterygoid

mandibular branch of trigeminal nerve (CN V3)

action of medial/ internal pterygoid

closes (elevates) the jaw

origin of temporalis

temporal fossa of temporalis and sphenoid

insertion of temporalis

coronoid process of mandible

innervation of temporalis

mandibular branch of trigeminal nerve (CN V3)

action of temporalis

• anterior fibers: closes (elevates) jaw

• middle + posterior fibers: retract mandible (open jaw)

origin of lateral/ external pterygoid

• superior head: greater wing of sphenoid

• inferior head: lateral pterygoid plate

insertion of lateral/ external pterygoid

joint capsule of condylar process

innervation of lateral/ external pterygoid

mandibular branch of trigeminal nerve (CN V3)

action of lateral/ external pterygoid

protrusion of the jaw. The only muscle of the masticators to protrude the jaw