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Anatomy of the Posterior Triangle of the Neck

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Sternocleidomastoid Muscle.  It also acts as an accessory muscle of inspiration, along with the  scalene muscles  of the neck Sternocleidomastoid The  triangles of the neck . (Anterior triangles to the left; posterior triangles to the right.) Muscles of the neck. Lateral view. Latin musculus sternocleidomastoideus Gray's subject #111 390 Origin manubrium sterni ,  medial  portion of the  clavicle Insertion mastoid process of the temporal bone ,  superior nuchal line  of the occipital bone Artery occipital artery  and the  superior thyroid artery Nerve motor:  accessory nerve sensory:  cervical plexus  (ventral ramus of the second cranial nerve) Actions Acting alone, tilts head to its own side and rotates it so the face is turned towards the opposite side. Acting together, flexes the neck, raises the sternum and assists in forced inspiration. . The Sternocleidomastoid is crossed by the platysma and the External Jugular Vein. The Sternocleidomastoid covers the great ve