sternocleidomastoid muscle

Medical Dictionary

sternocleidomastoid muscle n.
A muscle with origin from the anterior surface of the episternum and from the sternal end of the clavicle, with insertion into the mastoid process and the superior nuchal line, with nerve supply from the accessory nerve, and whose action turns the head obliquely to the opposite side and flexes the neck and extends the head when both sides act together. Also called sternomastoid muscle.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
sternocleidomastoid muscle

noun
one of two thick muscles running from the sternum and clavicle to the mastoid and occipital bone; turns head obliquely to the opposite side; when acting together they flex the neck and extend the head [syn: sternocleidomastoid
WordNet® 3.0, © 2006 by Princeton University.
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