sternocleidomastoid muscle

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ster·no·clei·do·mas·toid mus·cle

(SCM) (stĕr'nō-klī'dō-mas'toyd mŭs'ĕl)
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 sternocleidomastoideus [TA] , sternomastoid muscle.

sternocleidomastoid muscle

Neck muscle. Origin: upper edge of manubrium, middle of upper clavicle. Insertion: mastoid process. Nerve: accessory (CN XI), spinal C2. Action: contralaterally rotates head.
See: face and headfor illus.
See also: muscle
References in periodicals archive ?
Fistulogram showed tracts on both sides extending from the junction of upper 2/3 and lower 1/3 of sternomastoid muscle up to the tonsillar fossa with extravasation of contrast in each tonsillar fossa.
3] Sinewy and elongated, sternomastoid muscles strained, Natalie Portman's neck too represents a particular state of the flesh, but what it ultimately brings to light are not metaphysical Platonic Ideas.
Intramuscular hemangiomas of the masseter and sternomastoid muscles.
They observed sternocleidooccipital, cliedomastoid and sternomastoid muscles in the same cadaver unilaterally.