The Latissimus Dorsi Viewed Laterally in a Male

Description

Prominent in lateral profile, the latissimus dorsi fans over the posterolateral thoracic wall, arising broadly from the thoracolumbar fascia and lower thoracic spinous processes, with additional slips from the iliac crest and inferior ribs. Its fibers converge superolaterally to form a thick tendon that passes anterior to the inferolateral scapular border and approaches the proximal humerus at the floor of the intertubercular sulcus. Posterior ribs and thoracic vertebrae provide bony context, while the scapula and proximal humeral shaft mark the shoulder girdle relationship. Fiber direction is clear. For shoulder mechanics, a lateral view matters because it clarifies how latissimus dorsi crosses the glenohumeral joint to generate extension, adduction, and internal rotation, and how its line of pull changes with scapulothoracic position. Surgeons also rely on this anatomy when raising a pedicled latissimus dorsi flap for breast or chest wall reconstruction, keeping the thoracodorsal artery and nerve intact as they enter the deep surface near the posterior axillary fold. The same region is examined in athletes with posterior axillary pain from latissimus or teres major myotendinous injury, where the tendon’s course toward the humerus can be confused without a clean lateral landmark set. Use this plate for teaching upper limb kinesiology in gross anatomy or physical therapy curricula, for operative atlases describing posterior axillary fold exposure and flap harvest, and for patient-facing education explaining why latissimus tightness can limit overhead elevation by restricting scapular upward rotation and thoracic extension. It also suits radiology or sports medicine notes correlating clinical tenderness at the posterior axillary fold with the tendon’s humeral insertion. Anatomical accuracy verified by SciePro's Medical Advisory Board.