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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.
Contraction in skeletal muscle begins with a nerve impulse-acetlycholine is released at the neuromuscular junction and binds to receptors in the muscle. This causes the rele â¦ ase of calcium ions from the sarcoplasmic reticulum.he actin is then pulled (slides) across the myosin. Unlike skeletal muscle, there is no neuromuscular junction or troponin in smooth muscle. Instead, contraction is started by the release of neurotransmitter vesicles (membrane bound containers) into the space between the cells.