Sternocleidomastoid

Sternocleidomastoid

The Sternocleidomastoid is a muscle in the neck that acts to flex and rotate the head. It is named for its attachment points at the sternum, clavicle, and mastoid process of the temporal bone.

Structure

The sternocleidomastoid originates from two locations: the manubrium of the sternum and the clavicle. It travels obliquely across the side of the neck and inserts at the mastoid process of the temporal bone of the skull. The sternocleidomastoid is divided into a sternal head and a clavicular head.

Function

The sternocleidomastoid has several actions on the head and neck. It acts to flex the neck, and it also rotates the head to the opposite side. When both sides act together, they flex the neck and extend the head. When one side acts alone, it causes the head to rotate to the opposite side and flexes the neck.

Clinical significance

The sternocleidomastoid can be palpated by healthcare professionals to assess for abnormalities. It can be affected by conditions such as Torticollis, in which the muscle is shortened and causes the head to tilt to one side.

See also

• Neck muscle
• Torticollis

References

Sternocleidomastoid Resources
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