sternocleidomastoid (muscle)

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ster·no·clei·do·mas·toid (mus·cle) (SCM),

superficial muscle of the anterolateral neck; origin, by two heads from anterior surface of manubrium of the sternum and sternal end of clavicle; insertion, mastoid process and lateral half of superior nuchal line; action, turns head obliquely to opposite side; when acting together, flex the neck and extend the head; nerve supply, motor by accessory, sensory by cervical plexus.
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