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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.]
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"
References in periodicals archive ?
Physical examination revealed two cervical openings located at the anterior border of the bilateral sternocleidomastoid (SCM) muscles at the level of the hyoid bone.
Axial ultrasound images of patient revealing presence of intraluminal calcification (arrow) at level of bifurcation of left common carotid artery (a) without and (b) SCM: Sternocleidomastoid muscle; ICA: Internal carotid artery; ECA: External carotid artery; V: Internal jugular vein.
They rarely originate in the trapezius, sternocleidomastoid, and temporal muscles.
An initial US scan was performed with the middle of the probe along the apex of the triangle formed by the 2 heads of sternocleidomastoid muscles and clavicle using SonoSite 180 plus and a linear array 6-13 MHz probe (SonoSite Drive SE Bothell, WA, USA).
The triangle formed by the two heads of sternocleidomastoid muscle and clavicle was identified.
With the projectile still in place, routine anterior sternocleidomastoid incision was made.
oc), masseter, sternocleidomastoid (SCM), biceps brachii, abductor pollicis brevis (APB), and tibialis anterior muscles after supraorbital electrical stimuli, auditory stimuli (auditory startle reflex, ASR), and electrical stimuli of the median nerve at the wrist (startle reflex to somatosensory inputs, SSS).
Clinical examination and imaging tests revealed an abscess in the left sternocleidomastoid muscle.
Blunt dissection was carefully performed with a vascular tunneler from the incision superiorly to the suprasternal fossa [Figure 1], area A] in trajectory lines and laterally to the medial border of the sternocleidomastoid muscle.
The sternocleidomastoid, a muscle running along the side of the neck, was placed over the matrix and the adhesive platelet-rich plasma gel.
On examination there was tenderness at right submandibular area along the upper portion of sternocleidomastoid muscle.
The nontender and nonmobile mass was located in the left mid and lower neck, superior to the clavicle and posterior to the sternocleidomastoid muscle.

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