Superficial head : Tuberosity of maxilla and pyramidal. Gross anatomy Each pterygoid process projects. ORIGIN Deep head medial side of lateral pterygoid plate and fossa between medial and lateral plates. ORIGIN Upper head: infratemporal surface of sphenoid bone. INSERTION Pterygoid fovea below condyloid. The medial pterygoid ( or internal pterygoid muscle), is a thick, quadrilateral muscle of mastication. The mandibular branch of the fifth cranial nerve, the trigeminal. Pătrunderea pterygoid a articulației. The medial pterygoid ( or internal pterygoid muscle), is a thick, quadrilateral muscle of mastication. Lower head: lateral surface of lateral pterygoid plate.
The pterygoid fossa is an anatomical term for the fossa formed by the divergence of the lateral pterygoid plate and the medial pterygoid plate of the sphenoid. The pterygoid processes or pterygoid plates are paired posteroinferior projections of the sphenoid bone.