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The internal pudendal artery becomes the common penile artery after giving off a branch to the perineum. The three branches of the penile artery are the dorsal, bulbourethral, and cavernous. Distally, they join to form a vascular ring near the glans. The dorsal artery is responsible for engorgement of the glans during erection. The bulbourethral artery supplies the bulb and corpus spongiosum. The cavernous artery effects tumescence of the corpus cavernosum and enters it at the hilum of the penis, where the two crura merge. It gives off many helicine arteries along its course, which supply the trabecular erectile tissue and the sinusoids ( Fig. 26-3B ). These helicine arteries are contracted and tortuous in the flaccid state and become dilated and straight during erection. Diallo and associates (2013) noted that in four of their five cadaveric specimens, the dorsal artery sent two to four penetrating branches to join the cavernous artery and supply blood to the distal one third of the penis. The bulbourethral and urethral arteries are situated outside the tunica albuginea of the corpus spongiosum on the lateral and dorsal sides. Anastomosis of the cavernous and urethral arteries occurs outside the tunica of the spongiosum.