Thoracodorsal Artery

Description

Arising as a terminal branch of the subscapular artery, the thoracodorsal artery descends along the posterior axillary wall and tracks inferiorly on the deep surface of latissimus dorsi. From a posterior perspective, it lies medial to the surgical neck region of the humerus, closely related to the lateral border of the scapula and the posterior ribs that form the thoracic cage. Distally, the vessel resolves into multiple arteriolar branches that fan out within the muscle belly toward the inferolateral back. Small-caliber ramifications are the point. For reconstructive surgeons, this course matters because the thoracodorsal artery forms the dominant pedicle for the latissimus dorsi flap, with its caliber and length supporting pedicled transfer to the anterior chest or free tissue transfer. Injury or ligation can occur during axillary lymph node dissection or posterior axillary approaches, and awareness of its descent helps prevent ischemia of the latissimus dorsi and reduces bleeding along the posterior chest wall. The illustration also supports teaching of axillary arterial branching patterns by linking the subscapular system to a clear, muscle-specific distribution. Use this artwork in anatomy lab manuals and surgical texts covering the axilla, scapular region, and posterior thoracic wall, or in lectures on reconstructive options after mastectomy and traumatic soft-tissue loss. It also fits radiology and ultrasound teaching when correlating Doppler assessment of the thoracodorsal pedicle with surface landmarks along the posterior axillary fold. Anatomical accuracy verified by SciePro's Medical Advisory Board.