Muscles of Mastication Flashcards
temporalis
-origin
floor of temporal fossa
deep surface of temporal fascia`
temporalis
-insertion
tip of medial surface of coronoid process
anterior border of ramus of mandible
temporalis
-action
elevates mandible closing jaw
posterior fibers retrude protrude jaw
temporalis
-innervation
deep temporal branches of mandibular nerve (CN V3)
masseter
-origin
inferior border and medial surface of zygomatic arch
masseter
-insertion
lateral surface of ramus of mandible
coronoid process of mandible
masseter
-action
elevates and protrudes mandible, closing jaw
deep fibers retrude mandible
masseter
-innervation
masseteris nerve - branches of mandibular nerve (CN V3)
lateral pterygoid
-origin
superior head
-infratemporal surface and infratemporal crest of greater wing of sphenoid
inferior head
-lateral surface of lateral pterygoid plate
lateral pterygoid
-insertion
neck of mandible
articular disc and capsule of TMJ
lateral pterygoid
-action
bilaterally -protrude mandible -drop jaw unilaterally -alternatively produce side-to-side movement of mandible
lateral pterygoid
-innervation
lateral pterygoid nerve
-branch of mandibular nerve (CN V3)
medial pterygoid
-origin
deep head -hedial surface of lateral pterygoid plate -pyramidal process of palatine bone superficial head -tuberosity of maxilla
medial pterygoid
-insertion
medial surface of ramus of mandible inferior to mandibular foramen
medial pterygoid
-action
helps elevate mandible, closing jaw bilaterally -helps protrude mandible acting alternately -produce grinding
