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The sternocephalicus is a part of the sternocleidomastoid muscle, which "passes obliquely across the side of the neck, being enclosed between the two layers of deep cervical fascia." The origin of its name, sternocleidomastoid, stems from the fact that it has two heads, extending from the sternum and the clavicle.

The sternocleidomastoid has three major actions; the first is to bring the head to the shoulder. The second is to rotate the head and the third is to assist in "elevating the thorax during forced inspiration."

[The quotes are from the 1977 Collector's Edition of Henry Gray's Gray's Anatomy.]

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Q: What is the sternocephalicus muscle?
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