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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.
Cardiac muscle contraction occurs by utilising the sliding filament model already described for skeletal muscle. Steps in the contractile process are very similar:-. 1  The action potential spreads from the cell membrane into the T tubules. 2  Calcium enters the cell from the ECF (this doesn't happen in skeletal muscle).ike skeletal muscle, the SARCOMERE is the contractile unit of the myocardial cell. It contains myosin and actin filaments as well as troponin and tropomysin. Shortening of sarcomeres causes contraction by the sliding filament model already described.