Dorsal Branches of Posterior Intercostal Veins, Posterior View

Description

Posteriorly oriented, this plate centers on the dorsal branches of the posterior intercostal veins as they diverge from the intercostal spaces and course medially toward the vertebral column, then fan superficially into the paraspinal soft tissues. Tributaries track along the deep surface of the trapezius and latissimus dorsi while also threading between erector spinae components (iliocostalis, longissimus, spinalis) adjacent to the thoracic spinous processes. Blue venous channels run segmentally, with proximal collecting veins lying nearer the rib angles and distal venules dispersing laterally into the dorsal musculature. Orientation is strict anatomical position. That segmental pattern matters when you are teaching posterior thoracic wall drainage and its connections to the azygos system, but it also intersects everyday procedure. Paraspinal approaches, thoracic epidurals, and posterior thoracotomy planning all benefit from a clear mental map of where these dorsal venous branches lie relative to the rib spaces and the midline, because venous bleeding in muscle can obscure landmarks quickly. Small vessels. Real consequences. The posterior intercostal venous network also provides a practical framework for understanding why dorsal muscular pain or inflammation can track along segmental territories that mirror the intercostal spaces. Use this illustration in gross anatomy or regional anatomy courses covering the back and thoracic wall, in surgical atlases discussing posterior approaches to the thorax, and in MSK or pain-medicine teaching materials that emphasize paraspinal anatomy and procedure-related bleeding risk. It also fits well in publisher layouts that need a clean posterior view of venous drainage over layered back muscles in an adult male. Anatomical accuracy verified by SciePro's Medical Advisory Board.