The Blood Supply and Venous Drainage of the Penis
In all the domestic species the main supply of arterial blood to the penis is via the internal pudendal artery, a branch of the internal iliac artery (see Section 8.1.10 and Figure 8.2).
The internal pudendal artery terminates as the artery of the penis that immediately gives rise to three branches, namely the dorsal artery of the penis, the artery of the bulb of the penis and the deep artery of the bulb.The internal pudendal artery bends around the ischial arch and gives rise to several branches that supply the corpus spongiosum and the corpus cavernosum. The internal pudendal artery then continues as the dorsal artery of the penis and is located external to the tunica albuginea (see Sections 15.3.2 and 15.5.1). In most species the corpus spongiosum and the corpus cavernosum drain into the internal iliac vein via the pudendal vein (see Sections 9.1 and 9.1.3 and Figure 9.1). There are normally no vascular connections between the corpus spongiosum and the corpus cavernosum.
15.5