The sternocleidomastoid muscle... - Bradley Blair Osteopath

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The sternocleidomastoid muscle is a two-headed neck muscle, which true to its name bears attachments to the manubrium of sternum (sterno-), the clavicle (-cleido-), and the mastoid process of the temporal bone (-mastoid). SCM The sternal head originates from the manubrium of sternum, while the clavicular head from the medial third of the clavicle. The two heads join into one muscle belly that goes on to insert on the lateral surface of the mastoid process of the temporal bone and the lateral hal