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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.
1 Acting unilaterally, contraction of the SCM muscle turns the head towards the opposite side, while bilateral contraction flexes the neck and head forward.  The most important function of the SCM is to control and monitor the headâs position in space.