With the lateral border of the infratemporal fossa removed, examine the orientation of the pterygoid muscles within the fossa. The medial pterygoid muscle arises from the pterygoid fossa and maxillary tuberosity and inserts into the medial surface of the angle of the mandible. The lateral pterygoid muscle [cross-section] arises from the lateral pterygoid plate and the base of the greater wing of the sphenoid. It is composed of two heads. The superior head of the lateral pterygoid muscle inserts into the articular disc of the temporomandibular joint; the inferior head inserts into the pterygoid fovea on the ramus of the mandible.
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