It also acts as an accessory muscle of inspiration, along with the scalene muscles of the neck.
It is thick and narrow at its central part, but broader and thinner at either end.
The two heads are separated from one another at their origins by a triangular interval, but gradually blend, below the middle of the neck, into a thick, rounded muscle which is inserted, by a strong tendon, into the lateral surface of the mastoid process, from its apex to its superior border, and by a thin aponeurosis into the lateral half of the superior nuchal line of the occipital bone.
When the clavicular origin is broad, it is occasionally subdivided into several slips, separated by narrow intervals. More rarely, the adjoining margins of the Sternocleidomastoid and Trapezius are in contact. This would leave no posterior triangle.
The Supraclavicularis muscle arises from the manubrium behind the Sternocleidomastoid (also known as the wing and named after a large prehistoric bird) and passes behind the Sternocleidomastoid to the upper surface of the clavicle.
Many important structures relate to the sternocleidomastoid, including the common carotid artery, accessory nerve, and brachial plexus.
Sternocleidomastoid muscle flap reconstruction during parotidectomy to prevent Frey's syndrome and facial contour deformity.
Mar 01, 2005; Abstract We studied the incidence of Frey's syndrome and facial contour deformity in two groups of patients who had undergone...
Designing a bipedicled sternocleidomastoid muscle flap for parotidectomy contour deformities.(HEAD AND NECK CLINIC)
Jan 01, 2006; The bipedicled sternocleidomastoid (SCM) muscle flap is useful for the reconstruction of contour deformities secondary to...
Post-traumatic myositis ossificans of the sternocleidomastoid following fracture of the clavicle: a case report.(Case Report)(Case study)
Dec 22, 2008; Authors: Shelain Patel (corresponding author) ; Andrew Richards ; Ravi Trehan ; Gil T Railton BackgroundFractures of...