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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.
Muscle contractions might: 1  Begin in a single area, such as your leg, neck or arm. Focal dystonia that begins after age 21 usually starts in the neck, arm or face and tends to remain focal or segmental. 2  Occur during a specific action, such as handwriting. 3  Worsen with stress, fatigue or anxiety.  Become more noticeable over time.