Dorsal Scapular Nerve, Gross Anatomy

Description

Arising from the anterior rami of C5 (often with a C4 contribution), the dorsal scapular nerve is traced as it exits the cervical spine region and travels posterolaterally toward the scapula in a lateral male view. It pierces the middle scalene muscle, then descends deep to levator scapulae and along the medial border of the scapula, closely accompanying the deep surface of the rhomboid minor and rhomboid major. Posterior to the rib cage, the scapula lies superficial to the thoracic wall, while the nerve remains tethered to the posterior cervical triangle structures before reaching the periscapular musculature. Clear bony landmarks include the cervical and upper thoracic vertebrae, ribs, and the scapula, with the clavicle partially in frame superiorly. Clinically, this course matters because the dorsal scapular nerve is one of the few named motor nerves that traverses the scalene musculature, a common site of entrapment in patients with neck and medial scapular pain. Denervation of the rhomboids and levator scapulae can present as difficulty with scapular retraction and subtle scapular winging that is accentuated during pushing or resisted shoulder elevation. Needle EMG planning and ultrasound guided injections around the scalene triangle benefit from an accurate mental map of the nerve’s relationship to the cervical transverse processes, first rib, and the medial scapular border. Anatomy faculty can place this plate directly into brachial plexus lectures that extend beyond trunks and cords to posterior cervical triangle branches, and into musculoskeletal modules on scapulothoracic mechanics. It also fits well in clinical teaching files for differential diagnosis of interscapular pain, including dorsal scapular neuropathy versus long thoracic nerve palsy, and in surgical education discussing posterior cervical approaches and scalenectomy. Anatomical accuracy verified by SciePro's Medical Advisory Board.