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sternomastoid muscle --> sternocleidomastoid

(Science: anatomy, muscle) This is one of two muscles located on the front of the neckwhich serve to turn the head from side to side.

origin, sternum and clavicle; insertion, mastoid process; action, bends the head to the same side, rotates the head, raises the chin to the opposite side, together bend head forward and elevate chin.