Figure 7

Figure 7 Blood supply to each corpus cavernosum is derived from the internal iliac artery, a branch of the common iliac artery; the internal pudendal artery is one of the terminal branches of the internal iliac. In the pelvis, the internal iliac passes beneath the sacrospinous ligament and over the sacrotuberous ligament into Alcock's canal, where it runs under the pubic symphysis. After giving off the perineal artery, it becomes the common penile artery, giving off the bulbourethral, dorsal and cavernosal arteries before reaching the corpus cavernosum to form one element of the paired dorsal arteries