_d._ =A. saphena= (_f_).--The saphenous artery frequently takes origin in common with the superior articular (_h_), but may arise separately at about the same level. It passes distad across the gracilis (9), accompanied by the saphenous nerve (_g_) and vein, sends several branches dorsad (toward the knee), and at about the middle of the lower leg it divides into two main branches, a =dorsal= branch (_k_), passing to the dorsum of the foot, and a =plantar= branch (_j_), to the sole of the foot. The dorsal branch is accompanied by the main saphenous nerve (_g_) and vein. It sends one or two branches to the medial side of the ankle-joint, passes then onto the dorsum of the foot, and divides into four main branches. The medial one passes along the medial side of the medial digit; the other three pass to the intervals between the digits. Each divides into two branches which supply the contiguous sides of the two digits between which the interval lies. The dorsal branch thus supplies arteries to the sides of all the digits except to the lateral side of the lateral digit. This is supplied by A. suralis. The plantar branch (_j_) is larger than the dorsal. It passes distad on the medial surface of the flexor longus hallucis, accompanied by the tibial nerve, and across the space between the tendon of Achilles and the flexor. It gives superficial and deep branches to the structures about the ankle-joint, and sends inward a branch from the lateral side (Fig. 128, _d_) which joins the termination of A. tibialis anterior to form the plantar arch. It then passes distad along the plantar surface of the foot, nearer its medial border. Beneath the pad in the sole of the foot it divides into three branches which supply the interosseous spaces between the three digits. _e._ =A. poplitea.=--The main trunk of the femoral artery passes between the vastus medialis and the semimembranosus and then through the distal portion of the adductor femoris to reach the popliteal space. This is the space ventrad (or caudad) of the knee, between the biceps femoris on one side and the semimembranosus on the other. Here the artery receives the name =A. poplitea=, or popliteal artery. The popliteal artery gives off a number of large branches as it passes through the popliteal space, passes between the condyles of the femur and underneath the popliteal muscle, and finally turns dorsolaterad between the tibia and fibula, just distad of the head of the fibula. It now receives the name =A. tibialis anterior= and passes distad along the dorsal (anterior) border of the fibula. Branches of the popliteal artery: