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Sternocleidomastoid muscle. In human anatomy, the sternocleidomastoid muscle (/ËstÉËrnoÊËklaÉªdÉËmÃ¦sËtÉÉªd, -nÉ-, -doÊ-/), also known as sternomastoid and commonly abbreviated as SCM, is a paired muscle in the superficial layers of the side of the neck. It is one of the largest and most superficial cervical muscles.
Anatomy and supply. The masseter muscle is a thick, rectangular muscle of mastication. It consists of a superficial and a deep part, both originating from the zygomatic arch. The superficial part inserts on the masseteric tuberosity at the outer surface of the mandibular angle, whereas the deep part runs further dorsally to the outer surface of the mandibular ramus.