Palmar digital veins
The palmar digital veins carry deoxygenated blood away from the fingers to return it to the lungs and heart for circulation through the body. They are also known as volar digital veins. The palmar digital veins drain into the dorsal venous network on the back of the hand. This network is composed of dorsal metacarpal veins. The intercapitular veins connect the palmar digital veins with the dorsal venous network. They drain into a venous plexus located over the thenar and hypothenar eminences. Blood clots rarely occur in the palmar digital veins. There are three types of thromboses of these veins. The first is similar to varicose veins. The second develops in a normal vein and is not inflamed. The third is similar to Mondor's disease. Thromboses may present as an unsightly lump on the finger that has a bluish tint. A primary cause of thromboses in the palmar digital veins is injury to the fingers. Typically, the clot is removed by surgery.
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In Depth: Palmar digital veins