What is the longest vein in the human body?

The longest vein in the human body is the Greater Saphenous vein. This vein runs along the inner side of the leg and thigh, extending from the foot to the groin region, where it drains into the femoral vein. Its length and anatomical course make it the most prominent superficial vein in the body, often utilized in medical procedures such as bypass grafting due to its accessibility and size.

The other veins listed serve important functions within the vascular system but do not match the length of the Greater Saphenous vein. The Lesser Saphenous vein is smaller and shorter, running up the posterior aspects of the leg. The Femoral vein is a deep vein in the thigh that carries blood from the leg back to the heart but is not longer than the Greater Saphenous. The Jugular vein, primarily responsible for draining blood from the head and neck back to the heart, is also significantly shorter in comparison.