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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... spitting cobras spit venom. The palato-maxillary arch (comprising the pterygoid, palatine, ectopterygoid and maxilla) articulates with the skull ... (lateral surface) or broken colors (medial surface) for the following muscles: M. adductor mandibular externus superficialis (yellow); M. levator ...
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