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Quick Answer. Four muscles are used to chew food. They are the masseter, temporalis, medial pterygoid and lateral pterygoid. These muscles are responsible for the chewing action, moving the mandibles from side to side, grinding teeth and even helping us speak. They are also referred to as muscles of mastication..
Opens and closes the jaw. Allows chewing. Brachiocephalicus Wide strap like muscle. Base of the skull behind the jaw. Below the point of shoulder to the humerus. Moves the head from side to side, pulls the scapula forward, raises it in collection, swings the foreleg forward. Well developed for good movement.