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Lateral Pterygoid Muscle – Attachments, Actions & Innervation

image descriptionLateral Pterygoid Muscle

Mastication muscles
Lateral Pterygoid Muscle attached to the skull with other mastication muscles
Lateral Pterygoid Muscle attached to the skull with other mastication muscles
Lateral Pterygoid Muscle attached to the skull
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image descriptionAttachments of Lateral Pterygoid Muscle: Origin & Insertion

Origin: (proximal attachments):
a. Superior head: greater wing of sphenoid bone.
a. Inferior head: lateral surface of lateral pterygoid plate.

Insertion: (distal attachments):
Condyle of mandible and temporomandibular joint.

Lateral Pterygoid Muscle attached to the skull with other mastication muscles
Lateral Pterygoid Muscle attached to the skull
Lateral Pterygoid Muscle - Origin and Insertion
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Actions of Lateral Pterygoid Muscle on the mandible:

Together:

a. image descriptionProtract (or protrude) mandible.

Mandible protraction (1)
Mandible protraction (2)
Mandible protraction (3)
Mandible protraction (4)

b. image descriptionDepress mandible.

Mandible depression (1)
Mandible depression (2)
Mandible depression (3)
Mandible depression (4)
Mandible depression (5)

Individually: they image descriptionmove the mandible side to side.

Mandible movement (1)
Mandible movement (2)
Mandible movement (3)
Mandible movement (4)
Mandible movement (5)

Nerve to Muscle and its Spinal Segment:

Mandibular branch of trigemminal nerve (V).

Overview:

Lateral Pterygoid Muscle - Test yourself 1
Lateral Pterygoid Muscle - Test yourself 2
Lateral Pterygoid Muscle - Test yourself 3
Lateral Pterygoid Muscle - Test yourself 4
Lateral Pterygoid Muscle - Test yourself 5
Lateral Pterygoid Muscle - Test yourself 6
Lateral Pterygoid Muscle - Test yourself 7
Lateral Pterygoid Muscle - Test yourself 10
Test yourself while observing the Lateral Pterygoid Muscle
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