232 



MICROSCOPIC ANATOMY OF THE ORGANS. 



described glandular cells among the non-ciliated epithelium, 

 and have observed evidences of secretion in them. 



The walls of the vas epididymis are lined with a ciliated 

 epithelium in a single row, with, however, the nuclei at differ- 

 ent levels. Outside this are a membrana propria, a circular 

 muscle layer, and a connective-tissue coat (Fig. 179). The 



FIG. 17<t. 



'Sji(tff+**< W'i'11% ^'^I^S^SS:'^- 



vm 



Circular 

 'muscle layer 



4 



Ciliated 

 'epithelium 



W 



Transverse section of a human epididymis. X 300. 



coils of tubules of the vas epididymis and vasa efferentia are 

 joined together by fine loose connective tissue. 



The vas deferens (Fig. 180) is lined with an epithelium 

 which is thrown into longitudinal folds. In the upper part 

 the epithelium is like that of the vas epididymis, but lower 

 down passes over into a stratified cylindrical epithelium. Tint 

 tunica propria is a thin fibrous layer. Outside this is the sub- 

 mucosa, which consists of connective tissue with blood-vessels, 

 etc. Three coats of muscle surround the tube, a very thin 

 longitudinal layer next to the submucosa, a middle circular 

 coat, and an outer longitudinal layer. Outside these there is a 



