Muscles of Mastication

Muscles of mastication are innervated by:
mandibular division of trigeminal nerve V3

Muscles of mastication are derives from:
branchial arch 1

What are the muscles of mastication?
masseter, temporal, pterygoid lateral and pterygoid medial

What is the function of both mucles of mastication and of neck?
they work together to move the mandible

Which muscles are involved in elevation of the mandible?
masseter, temporalis and medial pterygoid

Which muscles are involved in depression of the mandible?
geniohyoid, mylohyoid, digastric, lateral pterygoid and infrahyoid

Which muscles are involved in protrusion of the mandible?
lateral pterygoid, and medial pterygoid assists

Which muscle is involved in retraction of the mandible?
temporalis

Which muscle is involved in lateral excursion of the mandible?
lateral pterygoid

Masseter
Origin: superficial head from anterior two thirds of lower border of zygomatic arch, deep head originates from posterior third and entire medial surface of zygomatic arch. Insertion: superficial head inserts on lateral surface of the angle and the deep head inserts on ramus above the angle. Action: bilateral contraction elevates mandible, clenches teeth

What is the most powerful muscle of mastication that can be palpated?
masseter

Temporal
Origin: temporal fossa. Insertion: anterior border of coronoid process and anterior border of ramus. Action: elevate mandible, retract mandible

Lateral Pterygoid
Origin: superior head from inferior surface of greater wing of sphenoid, inferior head lateral surface of lateral pterygoid plate of sphenoid. Insertion: anterior surface of neck of mandibular condyle at pterygoid fovea, a few of most superior fibers insert on capsule of TMJ. Action: inferior head depresses mandible, main action when both muscles contract brings lower jaw forward. if only one lateral pterygoid muscle contracted, lower jaw shifts to opposite side (lateral deviation)

Medial Pterygoid
Origin: pterygoid fossa on medial surface of lateral pterygoid plate. Insertion: medial surface of angle of mandible. Action: elevates mandible, protracts mandible

Which muscle lies deep to lateral pterygoid and is counter-part to masseter?
medial pterygoid

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