EXTERNAL ILIAC. 299 



One or more branches from it also pass to the lower part of 

 the rectum and sphincter ani, and are called the Lower Hcemorr- 

 hoidal Arteries. ; 



In its course, it sends off many small branches to the con- 

 tiguous parts ; one of which, called the Perineal (transversa 

 perinei) leaves it near the transversus perinei, and passes 

 between that muscle and the skin, and between the bulb of the 

 urethra and the crus of the penis, to the scrotum. 



When the Pudic has arrived near the bulb of the urethra, 

 it sends a branch into it, (arteria bulbi) which is continued 

 into the corpus spongiosum urethrae, and ramifies there 

 minutely. 



At the symphysis of the pubis it sends off a second branch, 

 which passes to the back of each crus, and, proceeding 

 along it, parallel to its fellow, terminates in the glans penis : in 

 this course it sends branches to the elastic coat, to the integu- 

 ments, and to the prepuce. This vessel is called the Arteria 

 Dorsalis. 



The main trunk of the pudic artery then penetrates the 

 corpus cavernosum, and proceeds through it in a straight direc- 

 tion. Its ramifications appear to be distributed through the 

 internal structure of the corpus cavernosum, and some of them 

 extend through the septum to the other side, while others pass 

 to the corpus spongiosum urethrae. 



The pndic artery sometimes though rarely takes a different 

 course from the one here described. Instead of coming out at 

 the sciatic notch, it passes directly forward by the side of the 

 bladder to the side of the prostate gland and gets to its proper 

 destination the corpus cavernosum and dorsum penis, below the 

 arch of the pubis. In such case of anomaly it is liable to be 

 cut as it crosses the prostate in the lateral operation for stone. 



The External Iliac, 



The great artery of the lower extremity, appears soon after 

 birth, like a continuation of the primitive iliac, and proceeds 

 along the brim of the pelvis behind the peritoneum, to Poupart's 

 ligament, or the crural arch, under which it passes. 



