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The three categories of head and neck muscles are the facial muscles, which control expressions; the muscles of mastication, which are involved in chewing; and the neck muscles, which facilitate movements such as bending and rotation of the head. Facial muscles include groups like the orbicularis oris and zygomaticus. The muscles of mastication primarily include the masseter and temporalis. Neck muscles encompass the sternocleidomastoid and trapezius, among others.

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1w ago

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