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musculus pterygoideus internus --> medial pterygoid

(Science: anatomy, muscle) origin, pterygoid fossa of sphenoid and tuberosity of maxilla; insertion, medial surface of mandible between angle and mylohyoid groove; action, elevates mandible closing jaw; nerve supply, nerve to medial pterygoid from mandibular division of trigeminal.

Synonym: musculus pterygoideus medialis, internal pterygoid muscle, musculus pterygoideus internus.