The internal pudendal vein is located in the gluteal region. It lies between the sacrospinous ligament and the sacrotuberous ligament and behind the ischial spine. The internal pudendal vein lies alongside the internal pudendal artery, which brings oxygenated blood to the same region. The pudendal nerve also lies alongside these two blood vessels and serves the same region. The internal pudendal vein, internal pudendal artery and pudendal nerve are bundled together by a thick sheet of fascia called the obturator internus fascia. This bundled group is called the pudendal canal. The internal pudendal vein drains deoxygenated blood from the perineum and external genetalia. The drained region includes the bulb of the penis or clitoris, the anal region and the urogenital region. Tributaries of the internal pudendal vein include the vein of the bulb, the posterior labial vein, the scrotal vein and the inferior rectal vein. The internal pudendal vein drains into the internal iliac vein. Despite its location, the deep dorsal vein, which drains the erectile bodies of the penis, does not pass into the internal pudendal vein.