Veins of Lower Limbs

Blood from the lower limbs is drained by deep veins and superficial veins. Deep veins include the posterior tibial vein, anterior tibial vein, and popliteal vein, which drain deep structures. Superficial veins, closer to the body's surface, include the great and small saphenous veins. Both types frequently interconnect throughout their course.

The popliteal vein forms at the knee where the anterior tibial vein unites with the posterior tibial vein. The posterior tibial vein is formed by the union of the medial and lateral plantar veins and ascends through the calf muscle after joining the fibular vein. This confluence creates the popliteal vein, positioned at the back of the knee.

The great saphenous vein, the body's longest vein, originates from the dorsal venous arch of the foot and travels along the medial aspect of the leg to the thigh. It drains into the femoral vein near the inguinal ligament. This superficial vein frequently interconnects with deep veins and the small saphenous vein throughout its course.

Upon entering the pelvis, the femoral vein continues as the external iliac vein. The external iliac vein merges with the internal iliac vein to form the common iliac vein, which eventually feeds into the inferior vena cava. This pathway ensures blood from the lower limbs reaches the central circulation.

The posterior tibial vein forms from the medial and lateral plantar veins and ascends through the calf muscle before joining the fibular vein. The anterior tibial vein is a continuation of the dorsalis pedis vein from the foot. Both unite at the knee to form the popliteal vein, which is essential for draining deep structures of the lower limb.

The small saphenous vein originates from the dorsal venous arch of the foot and runs along the lateral aspect of the leg through the calf muscles' deep fascia. It drains the calf muscles and empties directly into the popliteal vein at the knee, contributing to superficial venous drainage of the lower limb.

The great and small saphenous veins frequently interconnect with each other and with deep veins throughout their course in the lower limbs. Both superficial veins originate from the dorsal venous arch and eventually drain into deep veins: the great saphenous into the femoral vein and the small saphenous into the popliteal vein, creating an integrated drainage network.