In the skin region on the inner sides of the toes near their bases the small veins collect into five metatarsal veins. The largest vein collects the blood from the first, the second, and the third toe, passes up the tarsus and is called the vena metatarsalis interna, or vena magna (Fig. 65, No. 7). It is located just beneath the skin on the inner surface of the metatarsal bone. It passes in a circle, around the condyle of the tibia and becomes the =vena tibialis postica= (Fig. 65, No. 3 and 8). The vena tibialis postica passes under the tendon Achillis and the tendon of the flexor digitorum brevis, lies subcutaneously upon the latter, and reaching the knee-joint crosses over the upper surface of the ischiadic nerve and becomes the =vena poplitealis=, at which point it receives the vena tibialis antica. BRANCHES OF THE VENA CAVA POSTERIOR ( Vena ovariana ( Venæ testiculæ ( Vena proventricularis communis ( Vena suprarenalis revehentis ( Vena portalis magna sinistra ( Vena portalis magna dextra ( Venæ innominatæ ( Venæ hepaticæ Vena cava ( Vena cardis coronaria magna posterior ( Vena proventricularis inferior ( ( Vena iliaca interna ( Vena hypogastrica ( ( Vena iliaca externa ( Vena renalis ( ( Vena suprarenalis externa ( Vena iliaca ( Vena ischiadica ( communis ( Vena renalis ( ( Vena intervertebralis lumbalis ( ( Vena renalis magna ( Vena mesenterica communis ( Vena coccygo-mesenterica Vena ( ( Vena mesenterica anterior portalis ( Vena pancreatico-duodenalis dextra ( ( Vena proventricularis ( Vena proventricularis lienalis ( Vena splenica Vena coccygo-mesenterica ( Vena hemorrhoidalis On the dorsal side of the metatarsus are two veins. The =vena metatarsalis dorsalis profunda= (Fig. 65, No. 11), which extends under the tendon of the extensors of the toes, along with the artery and the nerve. It collects the blood from the third and the fourth toe and in the middle of the metatarsus receives the =vena metatarsalis dorsalis interna= (Fig. 65, No. 4), which connects the vena metatarsalis dorsalis profunda and the vena magna. The two dorsal veins anastomose with the vena magna, at the intertarsal joint. They pass transversely under the ligament and form the main trunk of the vena tibialis antica which lies close to the anterior surface of the tibia. Near this point there is formed a plexus of veins which again form a trunk and communicates with the vena peronealis and enters between the tibia and fibula with the tibialis antica. It extends along the flexure of the knee and the posterior part of the lower thigh.