Anatomical Structure and Location of the Posterior Scalene

Description

Posterior cervical musculature is rendered from a true dorsal perspective, with trapezius spanning from the occiput and nuchal ligament to the scapular spine, deltoid capping the shoulder laterally, and latissimus dorsi forming the inferolateral back. Deep to these superficial layers, the posterior scalene occupies the posterolateral neck, running obliquely from the posterior tubercles of the transverse processes of C4 to C6 inferiorly and laterally toward its insertion on the external surface of the second rib. Erector spinae columns parallel the spinous processes medially, while cervical fascia and tendinous attachments are differentiated in lighter tones around muscle borders and insertions. Fiber direction is clear. Because the posterior scalene sits just posterior to the interscalene interval, this view supports teaching of the scalene triangle and why neurovascular symptoms cluster in thoracic outlet syndrome, even when the anterior and middle scalenes receive most of the attention. Clinicians palpate and treat this region in cervical myofascial pain and whiplash-associated disorders, and understanding the posterior scalene’s rib attachment helps explain pain referral patterns with deep inspiration and why scalene hypertrophy can alter upper rib mechanics. For proceduralists, the depiction reinforces adjacent-at-risk structures during interscalene brachial plexus block and other lateral neck interventions, where deep needle placement can track toward pleura and create pneumothorax. Useful for gross anatomy labs, kinesiology instruction on cervical and upper thoracic respiration mechanics, and surgical education covering supraclavicular exposure and first and second rib relationships. It also fits atlas-style plates for physical therapy manuals and pain medicine presentations where fascia, tendon, and muscle layering must read cleanly in a posterior female neck and back. Anatomical accuracy verified by SciePro's Medical Advisory Board.