A Posterior View of the Posterior Scalene Muscle of a Male

Description

Running along the posterolateral neck, the posterior scalene (scalenus posterior) is shown deep to the superficial cervical fascia and posterior to the middle scalene, descending inferiorly to its insertion on the external surface of rib 2. The muscle belly sits lateral to the cervical vertebrae and medial to the levator scapulae and upper fibers of trapezius, with its superior attachments on the posterior tubercles of the transverse processes of C4 to C6. From this posterior perspective, its oblique fiber direction is clear as it courses inferolaterally toward the thoracic inlet. Deep anatomy, clean relationships. Recognition of the posterior scalene matters in the differential for thoracic outlet syndrome and lateral neck pain patterns, because hypertrophy or spasm can narrow the interscalene region and alter rib mechanics during inspiration. Although the brachial plexus and subclavian artery pass between the anterior and middle scalenes rather than behind them, the posterior scalene remains a practical landmark during posterior cervical and supraclavicular dissections when you need to orient to the scalene triangle and the first two ribs. Palpation and ultrasound-guided injections also hinge on distinguishing posterior scalene from the middle scalene and levator scapulae to avoid misplaced needling near the pleura. Use this artwork in gross anatomy teaching on the posterior triangle of the neck, in rehabilitation texts discussing scalene overactivity and accessory breathing, or in surgical education modules that map safe corridors around the thoracic inlet. It also supports pain medicine and sports medicine materials addressing scalene trigger points and rib elevation mechanics in overhead athletes. Anatomical accuracy verified by SciePro's Medical Advisory Board.