Muscles of Mastication Flashcards
Temporalis Action
Elevates mandible (closes jaw) Posterior fibres retract mandible
Temporalis Origin and Insertion
Origin:
Floor of temporal fossa, up to inferior temporal line, deep surface of temporal fascia
Insertion:
Coronoid process of the mandible, anterior ramus
Temporalis extra info
Fan shaped
Masseter Action
Elevates mandible
Assists in protrusion
Masseter Origin and Insertion
Origin:
Zygomatic bone and zygomatic arch
Insertion:
Angle and lateral side of ramus of the mandible
Masseter extra info
Quadrangular shaped
Medial pterygoid Action
Elevates mandible and assists protrusion
Unilaterally: grinding
Medial pterygoid Origin and Insertion
Origin:
Medial surface of lateral pterygoid plate, palatine & maxillary bone
Insertion:
Medial surface of mandibular ramus
Medial pterygoid extra info
Deep to ramus of mandible
Quadrangular shaped with 2 heads
Lateral pterygoid Action
Bilaterally: Protrudes mandible and depresses chin
Unilaterally: Moves jaw to contralateral side
Lateral pterygoid Origin and Insertion
Origin:
Greater wing of sphenoid; lateral surface of lateral pterygoid plate
Insertion:
Neck of mandible and articular disc
Lateral pterygoid extra info
Triangular shaped with 2 heads
Clinically important in treatment of TMJ dysfunction
Muscles of Mastication nerve supply
Cranial Nerve V3 mandibular branch of trigeminal nerve
