Definition: 'Sternocleidomastoid (muscle)'
sternocleidomastoid (muscle) (SCM)Type: Term
1. 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.
The definition information for sternocleidomastoid (muscle) is provided by Stedman's. You can search our medical dictionary here.