THE VAS DEFERENS 



385 



lumen give this portion of the duct a firm consistence and a cord- 

 like feel. 



In its ampulla the mucous membrane of the vas deferens is 

 more loosely attached and the folds or rugae, which elsewhere are 

 few in number, are here very pronounced. The lumen of the 

 ampulla is broad, but elsewhere the lumen of the vas is very 



FIG. 312. TRANSECTION OF THE VAS DEFERENS OF A DOG. 

 Hematein and eosin. Photo, x 104. 



narrow, especially when compared with its exceptionally thick 

 muscular wall. As in other portions of the excretory canal of 

 the testicle, the lumen of the vas deferens contains many sperma- 

 tozoa. 



The spermatic cord in its scrotal portion, in addition to the vas 

 deferens, contains a mass of connective tissue in which are em- 

 bedded the smooth muscle fibres of the internal cremaster muscle, 



