Posterior Superior Serratus, Posterior View

Description

Seen from a posterior perspective on an adult male, the serratus posterior superior occupies the upper thoracic wall deep to trapezius and rhomboid major and minor, arising from the lower cervical and upper thoracic midline (classically the nuchal ligament and spinous processes of C7 to T3). Its fibers run inferolaterally to insert onto the superior borders of ribs 2 through 5 near their angles, positioning it just medial to the scapular medial border and superior to the broad sweep of latissimus dorsi. Scapular muscles remain in view, with the infraspinatus on the posterior scapula identifiable inferior to the scapular spine and lateral to the vertebral column. Big surface landmarks stay obvious. This posterior view matters because the serratus posterior superior is frequently misunderstood in teaching as a primary inspiratory muscle, when in practice it behaves more like a proprioceptive and stabilizing layer over the upper ribs and costovertebral joints, a region implicated in cervicothoracic junction pain and intercostal neuralgia patterns. Clinically, it becomes a useful landmark when planning posterior thoracic wall approaches, including upper rib exposure, thoracic paravertebral blocks, and evaluation of pain after rib fracture near the angle where its slips attach. Its relationship to the scapular stabilizers also helps explain why posterior shoulder or periscapular discomfort can coexist with upper thoracic tenderness on palpation. Educators can slot this artwork into gross anatomy labs covering the intrinsic and extrinsic muscles of the back, or into rehabilitation materials discussing upper thoracic mechanics, scapulothoracic rhythm, and myofascial trigger point referral along ribs 2 to 5. Publishers will also find it suitable for surgical and anesthesia references that need a clean posterior map of layered musculature before describing rib-level incisions, paraspinal injections, or regional pain syndromes. Anatomical accuracy verified by SciePro's Medical Advisory Board.