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Nerve Origin" Supraclavicular branches Dorsal scapular Long thoracic Suprascapular Subclavian nerve (nerve to subclavius) Posterior aspect of anterior ramus of C5 with a frequent contribution from C4 Posterior aspect of anterior rami of C5, C6, C7 Superior trunk, receiving fibers from C5, C6, and of...

Nerve Origin" Supraclavicular branches Dorsal scapular Long thoracic Suprascapular Subclavian nerve (nerve to subclavius) Posterior aspect of anterior ramus of C5 with a frequent contribution from C4 Posterior aspect of anterior rami of C5, C6, C7 Superior trunk, receiving fibers from C5, C6, and often C4 Superior trunk, receiving fibers from C5, C6, and often C4 (Fig. 3.44B) Course Pierces middle scalene; descends deep to levator scapulae and rhomboids Passes through cervico-axillary canal (Fig. 3.14), descending posterior to C8 and T1 roots of plexus (anterior rami); runs inferiorly on superficial surface of serratus anterior Passes laterally across lateral cervical region (posterior triangle of neck), superior to brachial plexus; then through scapular notch inferior to superior transverse scapu- lar ligament Descends posterior to clavicle and anterior to brachial plexus and subclavian artery (Fig. 3.29); often giving an accessory root to phrenic nerve Structures Innervated Rhomboids; occasionally supplies levator scapulae Serratus anterior Supraspinatus and infraspinatus muscles; glenohumeral (shoulder) joint Subclavius and sternoclavicular joint (accessory phrenic root innervates diaphragm)