Full Sternal Head of Sternocleidomastoid Muscle Description
[Continued from above] . . . surface of the manubrium sterni, and is instructed to flow up, laterally, and back. It is a rounded fasiculus that is fleshy in back and tendinous in front. This and the other head, the clavicular head originate separately at a triangular interval. They eventually come together a little lower than the middle of the neck. This muscle gets worked into the lateral half of the superior nuchal line of the occipital bone. This occurs when the two heads merge into a thick muscle that gets tucked in to the lateral surface of the mastoid process, from its apex to its superior border, and by a thin aponeurosis by way of a strong tendon.