THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The internal, external, and common iliac nodes drain the pelvis and its contents, while the inferior epigastric vein empties into the external iliac vein. For example, the contents of the pelvic viscera are drained by the internal iliac nodes while being surrounded by branches of the internal iliac vessels.

Detailed explanation-2: -The internal pudendal vein drains to the internal iliac vein, whereas the median sacral veins drain into the common iliac vessels directly. The median sacral veins unite into a single vessel before entering the left common iliac vein.