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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.
Steps to Muscle Contraction. A nerve impulse travels to the . neuromuscular junction. on a muscle cell. The . neuromuscular junction . is the point where the axons of the nerve meet with the muscle cell. Ach is released from the axon to receptors located on the sarcolemma. The binding Ach causes . depolarization