

THE HYPOGASTRIC ARTERY 



The Inferior Hemorrhoidal Artery (a. hcemorrhoidalis inferior} arises from the 

 internal pudendal as it passes above the ischial tuberosity. Piercing the wall 

 of Alcock's canal it divides into two or three branches which cross the ischiorectal 

 fossa, and are distributed to the muscles and integument of the anal region, and 

 send offshoots around the lower edge of the Glutseus maximus to the skin of the 

 buttock. They anastomose with the corresponding vessels of the opposite side, with 

 the superior and middle hemorrhoidal, and with the perinea! artery. 



The Perineal Artery (a. perinei; superficial perineal artery) arises from the internal 

 pudendal, in front of the preceding branches, and turns upward, crossing either 

 over or under the Transversus perinsei superficialis, and runs forward, parallel 

 to the pubic arch, in the interspace between the Bulbocavernosus and Ischiocaver- 

 nosus, both of which it supplies, and finally divides into several posterior scrotal 

 branches which are distributed to the skin and dartos tunic of the scrotum. As 

 it crosses the Transversus perinsei superficialis it gives off the transverse perineal 

 artery which runs transversely on the cutaneous surface of the muscle, and anasto- 

 moses with the corresponding vessel of the opposite side and with the perineal 

 and inferior hemorrhoidal arteries. It supplies the Transversus perineei super- 

 ficialis and the structures between the anus and the urethral bulb. 



Deep artery of penis 

 Dorsal artery of penis 



Artery of urethral bulb 



Internal pudendal artery 



Bulbo-urethral gland 



FIG. 543. The deeper branches of the internal pudendal artery. 



The Artery of the Urethral Bulb (a. bulbi urethra;') is a short vessel of large caliber 

 which arises from the internal pudendal between the two layers of fascia of the uro- 

 genital diaphragm; it passes medialward, pierces the inferior fascia of the urogenital 

 diaphragm, and gives off branches which ramify in the bulb of the urethra and in 

 the posterior part of the corpus cavernosum urethrse. It gives off a small branch 

 to the bulbo-urethral gland. 



The Urethral Artery (a. urethralis) arises a short distance in front of the artery 

 of the urethral bulb. It runs forward and medialward, pierces the inferior fascia 

 of the urogenital diaphragm and enters the corpus cavernosum urethrse, in which 

 it is continued forward to the glans penis. 



