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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 motor nerves for the muscles of facial expression come from the facial nerve (CN VII). The muscles of mastication (the ones that move your mouth and jaw when you eat) are innervated by the mandibular nerve (motor fibers of CN V).