Muscle of Mastication

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  1. Masseter's origin
    zygomatic arch and zygomatic bone
  2. Masseter's insertion
    angle and ramus of mandible
  3. Masseter's action
    Prime mover of jaw closure; elevates mandible
  4. Temporalis's origin
    temporal fossa
  5. Temporalis's insertion
    coronoid process of mandible via a tendon that passes deep to zygomatic arch
  6. Temporalis's action
    closes jaw; elevates and retracts mandible; maintains position of mandible at rest; deep anterior part may help protract mandible
  7. Medial pterygoid's origin
    medial surface of lateral pterygoid plate of spenoid bone, maxilla, and palatine bone
  8. Medial pterygoid's insertion
    medial surface of mandible near its angle
  9. Medial pterygoid's action
    • acts with lateral pterygoid muscle to protrude (pull anteriorly) the mandible and promote side-to-side (grinding) movements;
    • synergist of temporalis and masseter muscles in elevation of the mandible
  10. lateral pterygoid's origin
    Great wing and lateral pterygoid plate of sphenoid bone
  11. lateral pterygoid's insertion
    condylar process of mandible and capsule of temporomandibular joint
  12. lateral pterygoid's action
    • provides forwards sliding and side-to-side grinding movements of the lower teeth;
    • protrudes mandible
Card Set:
Muscle of Mastication
2013-04-19 06:55:38

origin, insertion, and action
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