Mastication Muscles

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Reference: Snell, R.S. Clinical Anatomy by Regions. Lipponcott Williams and Wilkins. 351West St. Baltimore, MD, 21201, USA.

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4 Terms

1
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Masseter

O: Zygomatic arch of Temporalis

I: Angle of mandible

N: Trigeminal n. (V3), Mandibular branch

A: Closes (elevates) the jaw

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Medial/Internal Pterygoid

O: Medial surface of Lateral Pterygoid Plate

I: Medial aspect of the angle of the mandible

N: Trigeminal n. (V3), Mandibular branch

A: Closes (elevates) the jaw

3
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Temporalis

O: Temporal Fossa of Temporalis and Sphenoid

I: Coronoid process of mandible

N: Trigeminal n. (V3), Mandibular branch

A: Anterior Fibers: Closes (elevates) jaw; Middle + Posterior Fibers: Retract mandible (open jaw)

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Lateral/External Pterygoid

O: Superior Head: Greater wing of sphenoid; Inferior Head: Lateral Pterygoid plate

I: Joint capsule of Condylar Process

N: Trigeminal n. (V3), Mandibular branch

A: Protrusion of the jaw. The only muscle of the masticators to protrude the jaw.