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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..
The origin point of the Temporalis Muscle is along the entire rim of the Temporal Fossa of the Skull and itâs insertion point is the coronoid process of the mandible. The Masseter Muscle. The Masseter Muscle is a thick muscle which is primarily responsible for our chewing action.