Skip to Content
Medical Term:

sternocleidomastoid (muscle)


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.

Synonym(s): musculus sternocleidomastoideusTA, sternomastoid muscle

© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.