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The Masseter Muscle is a thick muscle which is primarily responsible for our chewing action. It is one of the strongest muscles in the entire human body. The Masseter muscle is a very thick muscle made up in two parts the Outer Masseter muscle and the Inner Masseter muscle.
the thick rectangular muscle in the cheek that functions to close the jaw. It is one of the four muscles of mastication. The masseter is innervated by the masseteric nerve from the mandibular division of the trigeminal nerve.The major jaw muscle, which participates in protraction, retraction and side to side movement of the jaw. Action. Closes jaw. muscle with origin from the inferior border and medial surface of the zygomatic arch, with insertion into the lateral surface of the ramus of the mandible, with nerve supply from the masseteric nerve, and whose action closes the jaw during chewing.