The uterine vein is a blood vessel that drains deoxygenated blood from the uterus. It is part of the venous system and plays a crucial role in returning blood to the heart. The uterine vein typically accompanies the uterine artery, which supplies oxygenated blood to the uterus. These veins are important during pregnancy, as they help manage increased blood flow to the uterus. They connect to the internal iliac vein, which ultimately channels blood back to the heart. Proper functioning of the uterine vein is essential for maintaining uterine health and supporting reproductive processes.