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?
Which muscle is involved in lateral excursion of the mandible?
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?
Origin: temporal fossa. Insertion: anterior border of coronoid process and anterior border of ramus. Action: elevate mandible, retract mandible
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)
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?