pterygoid muscles
TRANSCRIPT
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PTERYGOID MUSCLES
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SUPERIOR PTERYGOID MUSCLE
Short and thick
Has two separate heads Superior
head Inferior head
Lies superiorly to Inferior Pterygoid Muscle
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SUPERIOR HEAD
Smaller of the two heads
ORIGIN: Infratemporal crest of the greater wing of the sphenoid bone
INSERTION: Articular capsule and articular disc of the temporomandibular joint
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INFERIOR HEAD
ORIGIN: Lateral surface of pterygoid plate
INSERTION: Articular disc and pterygoid fovea
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INFERIOR HEAD (ORIGIN)
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ACTION
Depress the mandible Protrude mandible Side to side movement of mandible
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INNERVATION
Pterygoid branch of the mandibular division of the trigeminal nerve