Muscles of Mastication



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Niki Nelson www.AndyFutureRDH.com

Muscles of Mastication

(Receive motor innervation for cranial nerve V-trigeminal SVE)

Derived from components of 1st branchial arch

MUSCLE

ORIGIN

INSERTION

FUNCTION


INNERVATION

Masseter

Zygomatic arch

Lateral surface of ascending ramus

Elevates mandible

VIII

Temporalis


Temporal bone

Coronoid process & anterior border of ascending ramus

Ant.-elevates mandible

Post.-retrudes mandible



VIII

Medial Pterygoid (Internal)

Medial surface of lateral pterygoid plate

Medial surface of ascending ramus

Elevates mandible

VIII

Lateral Pterygoid (external)

Superior head



Greater wing of sphenoid bone

Articular disc of TMJ and neck of mandibular condyle

Stabilizes mandible

VIII


Lateral Pterygoid (external)

Inferior head



Lateral surface of lateral pterygoid plate

Anterior surface of condylar neck

Depresses and protrudes mandible

VIII




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