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Either of two muscles of the neck that serve to flex the neck and rotate the head.

[stern(um) + Greek kleis, kleid-, collarbone + mastoid.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.sternocleidomastoid - one of two thick muscles running from the sternum and clavicle to the mastoid and occipital bone; turns head obliquely to the opposite side; when acting together they flex the neck and extend the head
skeletal muscle, striated muscle - a muscle that is connected at either or both ends to a bone and so move parts of the skeleton; a muscle that is characterized by transverse stripes
cervix, neck - the part of an organism (human or animal) that connects the head to the rest of the body; "he admired her long graceful neck"; "the horse won by a neck"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
"Upper traps, levator scapulae and sternocleidomastoid swoop in and try to give support to the weak muscles.
The patient, having been diagnosed of ACC in her left parotid gland for 3 years, received surgical treatments including a total resection of left parotid gland, transplantation of facial nerve, and transferring of left sternocleidomastoid muscle flap.
It includes subhyoid depression, which visually enhances the impression that the neck is thin and long; visible thyroid cartilage bulge; a visible anterior border of the sternocleidomastoid muscle, distinct in its entire course from the mastoid to the sternum; and a cervicomental angle between 105 and 120 degrees.
Therefore, this research had as its intention, to verify if the existence of one chewing side preference, relates with the postural muscular electrical potential, represented by the sternocleidomastoid muscle, by the upper fibers of the trapezium, gluteus medius and anterior tibialis muscles, bilaterally.
A tracheostomy below the thyroid isthmus and bilateral neck dissection, preserving the spinal accessory nerve, internal jugular vein and sternocleidomastoid muscle, were performed (Figures 3 and 4).
Then it loops over the hypoglossal nerve and finally descends and opens on the skin of the lower neck along the anterior border of the sternocleidomastoid muscle.
Falla has reported that both the sternocleidomastoid and anterior scalene muscles' strength were significantly reduced in patients with neck pain at 25% of maximum voluntary contraction (p<0.05).
Cervical skin crease incision was given on the right side, intra-operatively the cystic mass was seen deep to the sternocleidomastoid muscle extending superiorly in the para-pharyngeal space and displacing the great vessels, although the mass was not adherent to the surrounding structures but its removal was difficult as it was deep to the carotid, vagus and internal jugular vein (Figure-3).
It then descends diagonally, superficial to the sternocleidomastoid muscle to reach the subclavian vein (Standring et al.).
The suppression of click evoked vestibulocollic reflex obtained from the sternocleidomastoid muscle is considered as a consequence of the long duration of dystonia, not a primary co-existing abnormality (5, 12).
A critical assessment of efficacy of sternocleidomastoid muscle flap which forms an effective tool in avoiding the major unfavourable outcome of surgery is undertaken in this descriptive study carried out on 22 patients.
After cleaning the skin with an antiseptic solution, a hypodermic needle is inserted along the posterior border of the sternocleidomastoid muscle, landmark was identified as the midline between the mastoid process and clavicular head of the sternocleidomastoid muscle, and three injections of 5mL of local anesthetic were done behind the posterior border of the sternocleidomastoid muscle subcutaneously, perpendicularly, cephalad, and caudad in a fan fashion.