REPRODUCTIVE ORGANS IN THE MALE. 289 



coats, an inner mucous, a middle muscular, and an 

 outer fibrous. The mucous membrane generally 

 presents two or three longitudinal folds and is lined 

 with simple columnar epithelium. According to 

 some investigators it may be ciliated in places and 

 even resemble the transitional epithelium of the 

 ureters. The membrana propria resembles that of 

 other mucous membranes. No glands are present. 

 The muscular layer is of the smooth variety. It con- 

 sists of a strong inner circular and an outer longi- 

 tudinal layer. Near the epididymis an extremely 

 thin layer of longitudinal muscle fibers is present 

 inside of the circular layer. The fibrous layer con- 

 sists of loose areolar tissue, with which are asso- 

 ciated blood and lymph vessels. 



Paradidymis. This consists of a set of branched 

 tubules that leads off as blind diverticulae from the 

 canal of the epididymis or the vas deferens. There 

 is one diverticulum or several of them. The length 

 of these tubules when unraveled varies from two to 

 twelve inches, and histologically they resemble the 

 structure of the vasa efferentia. Morphologically the 

 paradidymis is analogous to the paroophoron found 

 in the broad ligament of the ovary, the origin of 

 both being associated with the development of the 

 tubules of the mesonephros. 



Hydatid of Morgagni. There are two of these 

 bodies. One of them, more constant than the other, 

 lies usually between the globus major and the testi- 

 cle and is called the sessile hydatid. It is a small 

 cone-shaped body of epithelial cells and represents 

 the peritoneal end of Muller's duct, the analogue of 

 19 



