Signs & Symptoms of a Strained Sternocleidomastoid Muscle
The sternocleidomastoid, or SCM, muscle originates on the breastbone and attaches to the collarbone and the temporal bone on the back of the skull. You have one SCM on each side of your neck. These muscles tilt and rotate your head to the right and left. Sudden movements, such as whiplash, can cause SCM injury.
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