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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.
The superficial muscles form the characteristic âcalfâ shape of the posterior leg. They all insert into the calcaneus of the foot (the heel bone), via the calcaneal tendon.The calcaneal reflex tests spinal roots S1-S2. In the lower part of the leg, the muscle belly combines with the soleus to from the calcaneal tendon, with inserts onto the calcaneus (the heel bone). 2  Actions: It plantarflexes at the ankle joint, and because it crosses the knee, it is a flexor there. 3  Innervation: Tibial nerve.