ANTERIOR TIBIAL VEIN
In human beings, two anterior tibial veins are present (one on each side of the calf). Like most deep veins in the legs, it is also accompanied by the artery of similar name i.e. anterior tibial artery. It is formed from the dorsalis pedis veins, on the back of the foot, from where it runs upward in the interosseous membrane between the tibia and fibula bones all the way to the knee joint (elbow), where it joins posterior interosseous vein to from the popliteal vein which forms the femoral vein as it continues through the thigh.
Drainage: From knee joint, ankle joint, tibiofibular joint and structures from anterior portions of the lower leg.
POSTERIOR TIBIAL VEIN
There are two posterior tibial veins present in the human beings (one on each side of the calf), just like the anterior tibial veins. Like most deep veins in the legs, it is also accompanied by the artery of similar name i.e. posterior tibial artery. It is formed by the joining of foot veins that are present behind the medial malleolus bone, on medial side of the foot. From there it runs up the medial side of the lower legs (calves) to the knee joint where, at the back of the knee joint, it combines with the anterior tibial vein to form the popliteal vein.
Drainage: From knee joint, ankle joint, tibiofibular joint, sole of foot and structures from posterior compartment of the lower leg (calf).
Its most important drainage is by the perforator veins.