👉 The ah veins are a pair of small veins located on the inner surface of the thigh, near the knee joint. They run parallel to the femoral vein and are named after the German anatomist Karl Heinrich von Ahlefeldt. The ah veins drain into the femoral vein, which then empties into the inferior vena cava. These veins play an important role in the circulatory system by returning deoxygenated blood from the lower limb to the heart.
