part of part of tributary of tributary of vessel drains blood from system penis skin of penis prepuce of penis superficial external pudendal vein superficial dorsal vein of penis FMA:21384 A vein that drains the prepuce and skin of the penis, and, running backward in the subcutaneous tissue, inclines to the right or left, and opens into the corresponding superficial external pudendal vein, a tributary of the great saphenous vein.. UBERON:0039421 dorsal vein of penis