The Sternocleidomastoid muscle is a double-headed muscle that runs from the temporal bone (behind your ear) and the occipital bone (the base of the skull at the back of your head) into the top of the sternum (manubrium sterni) and into the middle of the collarbone (clavicle).

It is responsible for bending the neck to the same side and turning the head to the opposite side.

The first diagram demonstrates stretching the head that is attached to the collar bone and the second diagram demonstrates stretching the head that is attached to the sternum.

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