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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 human head can be divided into many different muscles groups differing in functions and actions. We will be examining the two main muscles of the head the Muscles of the face which are primarily responsible for our facial expressions and the muscles of mastication which are responsible for chewing.here are other important muscles located on or in the head such as the muscles of the tongue and throat and the extrinsic muscles of the eyes responsible for controlling the movement of our eyes, which we will not be discussing here.