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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.
Skeletal muscles move the bones of the body. The functional unit of skeletal muscle is a sarcomere, which consists of thick filaments, called myosin, and thin filaments, called actin. The action of the actin and myosin fibers sliding past one another causes the muscle to contract. The neuromuscular junction is where the nerve cell meets the muscle.