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 knowledge of the anatomy of neck is vital and the relationship of the IJV to the sternocleidomastoid muscle and CA is the key for understanding the position of the vein in the neck.
Queiroz Filho W, Dedivitis RA, Rapoport A, Guimaraes AV Sternocleidomastoid muscle flap preventing Frey syndrome following parotidectomy.
For the preservation of parathyroid function, two strategies were adopted; either to preserve the glands in situ or to autotransplant at least one parathyroid gland in the ipsilateral sternocleidomastoid muscle, and, accordingly, the patients were divided into two groups.
The accessory nerve was stimulated with a bipolar surface stimulator 1-2 cm posterior to the posterior border of the sternocleidomastoid muscle, mid-way between the mastoid process and the suprasternal notch.
Myositis ossificans traumatic of sternocleidomastoid muscle presenting as cervi- cal lymph-node metastasis.
Inflammatory collections form inferior to the mastoid process and may course along the plane of the sternocleidomastoid muscle to the lower neck.
The anterior division then continued downwards and medially as the anomalous EJV, along the anterior border of sternocleidomastoid muscle and reached the jugular notch where it crossed the midline to drain into the opposite (right) subclavian vein (RSV).
The cause is thought to be fibrosis or compartment syndrome of the sternocleidomastoid muscle.
Swelling and tenderness at the angle of the jaw and along the sternocleidomastoid muscle indicate internal jugular vein thrombophlebitis.
They are superficial to the recurrent laryngeal nerve, with an external opening on the anterior border of the lower sternocleidomastoid muscle.
This approach exploits the intermuscular plane between sternocleidomastoid muscle, carotid artery and jugular vein laterally and the strap muscles, trachea and oesophagus medially.

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