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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Neck examination showed B/L fistulous openings which were present at the junction of upper 2/3rd and lower 1/3rd of anterior border of sternomastoid muscle.
The effectiveness of a sternomastoid muscle flap in preventing post-parotidectomy occurrence of the Frey syndrome.
[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. Ear Nose Throat J 1993;72(4):303-5.