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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.
More Information about the Sternocleidomastoid Muscle. The sternocleiodmastoid muscle is commonly abbreviated as SCM. In addition to its movement functions, this paired muscle aids in inspiration along with the scalene muscles. The sternocleidomastoid muscle is named so because of its anatomy. Since it originates at the manubrium of the sternum (sterno) & the clavicle (cleido) and inserts at the mastoid process (mastoid). Back to Functional Anatomy Chart.