660 THE PENIS. 



it approaches the glans, where it becomes so large as to 

 receive the name of fossa navicularis. The mucous coat is 

 very sensitive, and so numerous and superficial are its veins, 

 as to bleed freely, often, on introducing the catheter. The 

 urethra abounds with mucous lacunae, especially upon its 

 upper wall, which discharge their secretions into this canal ; 

 their orifices present forward, and are believed sometimes 

 to interrupt the course of the catheter. One of these, about an 

 inch and a half, from the meatus is named the lacuna magna. 



Cowper's Glands. These are two bodies about the size of 

 peas situated behind the bulb, and covered by the accelera- 

 tores urinae muscles. They are of a yellowish color, hard, 

 and sometimes not found. They each discharge into the 

 urethra in front of the bulb by an excretory duct which 

 runs forward for about an inch. 



The arteries of the* penis come from the terminal branches 

 of the internal pudic. The internal pudic arises from the 

 internal iliac, forming one of its terminating branches ; 

 sometimes it comes from the ischiatic, along with which it 

 leaves the pelvis below the pyriform muscle, returns again 

 between the sacro-sciatic ligaments, and then ascends along 

 the inner side of the tuber and ramus of the ischium and 

 pubis, to a short distance below the symphysis, wheie it ends 

 in two branches. In this course, besides supplying branches 

 to the bladder, rectum, vesiculse seminales, prostate, and to 

 the vagina in the female, it sends off opposite the ramua 

 of the ischium the artery of the bulb, which passes between 

 the triangular ligament, and is distributed through the 

 corpus spongiosum as far as the glans. 



The terminating branches of the internal pudic are the 

 arteria dorsalis penis and arteria corporis cavernosi. The 

 former goes between the crura upon the dorsum of the 

 penis as far as the prepuce, which it supplies, also forming 

 a circle around the corona glandis, and anastomosing with 

 branches in the glans of the corpus spongiosum. The 

 artery of the corpus cavernosum enters the crus, and runs 

 along the septum, giving oif branches as it proceeds. 



Muller speaks of arteries which he calls arterice helecince, 



