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 ?
Thymic cysts can occur anywhere from the angle of the mandible, along the lateral neck, to the sternal notch, but cervical thymic cysts occur more frequently in the lower third of the neck on the left side anterior to the sternocleidomastoid muscle.
The cysts usually present as a unilocular cystic mass extending inferiorly within the neck, paralleling the sternocleidomastoid muscle (Figure 17).
5) The great auricular nerve exits the cervical plexus along the posterior margin of the sternocleidomastoid muscle, and it extends anteriorly along the lateral aspect of the sternocleidomastoid muscle and the parotid gland superiorly, where it further divides into anterior and posterior branches.
The combination of a parapharyngeal abscess and torticollis due to spastic contractions of the sternocleidomastoid muscle is an extremely rare condition.
The mass was located in the anterior triangle of the neck on the right side, in the area of the sternocleidomastoid muscle.
At the level of C6, the brachial plexus lies within the interscalene space beneath the external jugular vein and the sternocleidomastoid muscle.
Occasionally, cysts may protrude between the internal and external carotid arteries; rarely, they are deep to the platysma muscle and anterior to the sternocleidomastoid muscle or located directly adjacent to the pharyngeal wall.
2) Complaints of intermittent mucoid drainage, recurrent inflammatory cellulitis, and/or abscess formation along the anterior border of the sternocleidomastoid muscle are common in patients with second branchial cleft anomalies.
9 yr) underwent primary closure along with a sternocleidomastoid muscle (SCMM) flap (flap group).
It manifests as a skin-colored nodule arising on or near the tragus (1) along an imaginary line drawn from the tragus to the angle of the mouth or (2) along the anterior margin of the sternocleidomastoid muscle.
The tumor was bound anteriorly by the anterior digastric muscle and posteriorly by the sternocleidomastoid muscle and retromandibular fossa.

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