Brachial Plexus

Wednesday, November 30, 2011

The brachial plexus is formed by the anterior branches of cervical spinal nerves from C5 to C8 and by a part of the thoracic spinal nerve (T1) nerve. The brachial plexus innervates the skin and muscles of the whole upper limb, except for the trapezius muscle and the skin region next to the axilla (armpit). The anterior branches pass through the scalene gap into the posterior cervical triangle, where they form three primary trunks above the clavicle: 1) the superior trunk (C5, C6); 2) the medial trunk (C7); 3) the inferior trunk (C8, T1).