| Term | Definition |
|---|
| Temporalis | Origin: floor of temporal fossa and deep temporal fascia.......... Insertion: coronoid process and ramus of mandible..........Action: elevates mandible and closes jaw; horizontal fibers retract mandible..........Innervation: anterior trunk of mandibular nerve CN V3 via deep temporal branches |
| Masseter | Origin: maxillary process of zygomatic bone and zygomatic arch..........Insertion: angle and lateral surface of ramus of mandible.......... Action: elevates mandible and closes jaws; minimal protrusion of mandible..........Innervation: anterior trunk of mandibular nerve CN V3 via masseteric nerve |
| Lateral Pterygoid | Origin: infratemporal surface and greater wing of sphenoid; lateral pterygoid plate.......... Insertion: Upper Head: joint capsule and articular disc of TMJ----Inferior Head: pterygoid fovea on condyloid process of mandible.......... Action: Unilaterally: lateral chewing movements----Bilaterally: protracts mandible and depresses chin..........Innervation: anterior trunk of mandibular nerve CN V3 via lateral pterygoid nerve |
| Medial Pterygoid | Origin: lateral pterygoid plate and pyramidal process; tuberosity of maxilla.......... Insertion: medial ramus of mandible.......... Action: elevates mandible, protrusion, small grinding motion of teeth..........Innervation: anterior trunk of mandibular nerve CN V3 via medial pterygoid nerve |
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