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 ?
Topographic variation of the sternocleidomastoid muscle in a just been born children.
(43) A complete third branchial fistula has external communication anterior to the sternocleidomastoid muscle. The tract courses posterior to the common or internal carotid artery, anterior to the vagus nerve, and pierces the thyrohyoid membrane.
The puncture site of the skin was 1 cm lateral to the sternocleidomastoid muscle, which is a conventional puncture site for CVC insertion using the classical supraclavicular approach without the ultrasound (3).
Cervical magnetic resonance imaging (MRI) showed a heterogenous solid mass between the submandibular gland and sternocleidomastoid muscle. Thoracic and abdominal computed tomography (CT) results were normal.
A 24-year-old Lithuanian woman was referred to the general surgery clinic with an interest in neck surgery by her GP for further investigation of a right-sided neck swelling, along the full length of the sternocleidomastoid muscle (Fig.
CMT is caused by idiopathic, unilateral shortening of the sternocleidomastoid muscle and a sternocleidomastoid pseudotumour may be clinically apparent (Cheng et al, 2000).
Second branchial anomalies occur in the mid to lower portion of the neck along the anterior sternocleidomastoid muscle. Fistulas present as a tiny hole in the neck and can extend up to the tonsillar fossae.
The muscle with the longest name is the sternocleidomastoid muscle.
When a catheter is inserted into the internal jugular, the vessel entry site is located in the triangle created by the two inner sides of the sternocleidomastoid muscle and the clavicle (Seneff, 1991).
Nineteen cases showed definite decrements in LF-RNS tests in trapezius, while no abnormalities were found in the electromyography and neurological examination of the sternocleidomastoid muscle, supplied by the accessory nerve as well.
CT-scan revealed extension to the lower wall of the external auditory meatus and the upper extremity of sternocleidomastoid muscle. The patient showed no significant medical history.
A: Photo shows the appearance of the neck, with enlargement of the right side and obliteration of the space between the sternocleidomastoid muscle and the larynx.

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