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Sternocleidomastoid

Other Terms: Sternocleidomastoid muscle, Musculus sternocleidomastoideus, Muscle sterno-cléido-mastoïdien

Muscle parts

None

Latin name

Musculus sternocleidomastoideus

Latin muscle parts

None

Group

Branchial arch muscle – transition arch

Etymology

The English name for this muscle is the muscle of the breast, the clavicle bone, and the breast-like process. The term sterno comes from the Latin word sternon meaning “breast or chest,” the word cleido, refers to “the clavicle,” and the word mastoid comes from the Greek mastos meaning “breast” and eidos meaning “shape or form.”

Origin

Anterior upper margin of the manubrium of the sternum; superior aspect of the medial third of the clavicle

Insertion

Lateral side of the mastoid process and lateral portion of the superior nuchal line

Action

Unilaterally it extends (sternal fibers) or flexes (clavicular fibers) the head and rotates it toward the opposite shoulder; flexes and extends the head; raises rib cage

Nerve supply

Accessory nerve (Cranial nerve XI) and ventral rami of cervical spinal nerves (C2, 3, and 4)

Blood supply

From superior to inferior the muscle is supplied by the occipital branch of the posterior auricular, the sternocleidomastoid branches of the occipital artery, the sternocleidomastoid artery from the superior thyroid artery (sometimes arising directly from the external carotid artery), and from the suprascapular and superficial cervical arteries from the subclavian artery.

Latin

Musculus sternocleidomastoideus

French

Muscle sterno-cléido-mastoïdien

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