Download The angle of the mandible rests in this sling. The medial pterygoid

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Medial pterygoid
The angle of the mandible rests in this sling. The medial pterygoid muscle arises from
the medial surface of the lateral pterygoid plate and inserts on the medial surface of the
angle and ramus of the mandible.
Important: The medial pterygoid, masseter, and temporalis (mainly anterior portion)
elevate the mandible during jaw closing (biting and chewing).
1. The superior origin of the lateral pterygoid muscle is from the infratemporal
Notes crest of the greater wing of the sphenoid bone, and the inferior origin is from
the lateral surface of the lateral pterygoid plate of sphenoid bone. Both heads
insert at the articular disc of TMJ and neck of mandibular condyle.
Remember: • The mandible is protruded by the action of both lateral pterygoid muscles
• One muscle causes lateral deviation of the mandible (shifts
mandible to opposite side)
2. The masseter muscle originates from the lower border and medial surface
of the zygomatic arch. The muscles fibers run downward and backward to be
attached to the lateral aspect of the ramus of the mandible.
3. All of the muscles of mastication are innervated by the mandibular
division of the trigeminal nerve.
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