(redirected from Sternocleidomastoid muscles)
Also found in: Thesaurus, Medical, Encyclopedia.


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 ?
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 thyroid lobes extend to the midthyroid cartilage superiorly and lie adjacent to the carotid sheaths and sternocleidomastoid muscles laterally.
An incision lengthed about 5-8 cm was made two fingerbreadths from the suprasternal notch to cut open the skin and subcutaneous tissues, and to separate loose connective tissues of bilateral sternocleidomastoid muscles and infrahyoid muscles until the upper and lower planes of side thyroid lobes.
It differs from standard techniques because it involves simultaneously moving both sternocleidomastoid muscles farther apart, which causes the skin to be stretched over the thyroid gland, bringing it into relief and allowing for enhanced inspection and easier palpation.
The posterolateral boundaries of Sibson fascia are the vertebral column, first rib, levator scapulae muscle, and scalenus medius muscle; the medial boundary is formed by the superior mediastinal structures; and the anterior boundary is formed by the scalenus anterior and sternocleidomastoid muscles.
Campignion [3] suggested that the voluntary action of the cervical muscles, represented by the upper trapezius fibers and sternocleidomastoid muscles could be facilitated by the action of the cervical muscle group, resulting in greater coordination of movement, proximal stabilization and functional gain in the same region.
If electrode placement is not sufficiently anterior to the thyroid cartilage, one runs the risk of interference from the sternocleidomastoid muscles located on either side of the larynx.
Exercises on the Abshaper (Copperart Stores, Glendenning, NSW, Australia) generated significantly higher EMG activation in the upper rectus abdominis (UMA) and significantly lower activation in the sternocleidomastoid muscles compared with traditional exercises (20).
Asymmetric uptake in the sternocleidomastoid muscles, longus capitis, and longus colli is not uncommon.
The increased penetration of his torso and consequent neck hyper-flexion produced an immediate muscle spasm in his neck, especially in the left upper trapezius and left sternocleidomastoid muscles.
To relieve the pain, the NMT was applied to stretch the trapezius and sternocleidomastoid muscles.

Full browser ?