Posterior Anatomy of the Male Abdominal Region, Gross Anatomy

Description

Posterior trunk anatomy of an adult male is presented with the dorsal surface of the midsection centered on the broad latissimus dorsi as it sweeps superolaterally from the thoracolumbar fascia toward its humeral insertion. Superior to it, the inferior fibers of trapezius and the posterior axillary fold frame the posterolateral abdominal wall, while inferiorly the iliac crests mark the transition into the lumbosacral region. Medially, the midline overlies the thoracic and lumbar spinous processes; laterally, the flank corresponds to the posterolateral abdominal region overlying the external oblique and the deeper thoracolumbar fascia. Emphasis on the latissimus dorsi in posterior view matters because this muscle is both a dominant surface landmark and a common surgical and reconstructive workhorse. Flap planning for latissimus dorsi myocutaneous transfer relies on understanding its broad posterior origin and the way the posterior axillary fold defines its lateral border, while preserving the thoracodorsal neurovascular pedicle that enters on the deep surface near the axilla. Pain patterns and weakness with shoulder extension and adduction also track cleanly onto this anatomy, and the thoracolumbar fascia beneath it helps explain referral and load transfer in thoracolumbar strain. Use this artwork for gross anatomy teaching of the back and posterolateral abdomen, for surgical atlases covering flap harvest and posterior trunk approaches, and for clinical education materials that need clear surface relationships across the male torso and lower back. Anatomical accuracy verified by SciePro's Medical Advisory Board.