Structure of pterygoid muscle

Source:http://linkedlifedata.com/resource/umls/id/C0034001

MSH: Two of the masticatory muscles: the internal, or medial, pterygoid muscle and external, or lateral, pterygoid muscle. Action of the former is closing the jaws and that of the latter is opening the jaws, protruding the mandible, and moving the mandible from side to side.

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