SEMINAL VESICLE. 177 



surrounded by fibrous tissue containing transverse involuntary 

 muscle-cells. The coils of the canal are imbedded in and 

 separated by areolar tissue, and the whole epididymis is 

 enveloped in a fibrous capsule. At the lower end of the 

 epididymis its canal becomes and continues onward as the 

 vas deferens. 



Various remnants of foetal structures (vestiges of the AVolf- 

 fian body) are found about the testicle. 



The paradidymiSj or organ of Giraldes, is situated in the 

 connective tissue of the epididymis, and consists of a few 

 closed convoluted tubules lined with epithelium. The vas 

 aberrans is a tube similar to the vas deferens, and is some- 

 times found branching^ off from the lower part of the latter, 

 or canal of the epididymis, passes up the spermatic cord for 

 a variable short distance, and has a blind upper end. The 

 hydatids of Morgagni are small pedunculatecl bodies, contain- 

 ing areolar, epithelial, or vascular tissue, attached to the upper 

 part of the testis or epididymis. 



The vas deferens, the continuation of the lower end of the 

 canal of the epididymis, forms one of the constituents of the 

 spermatic cord, and extends to the base of the bladder, where 

 it becomes dilated (forming the "ampulla") and unites with 

 the outlet of the seminal vesicle. It is a firm cordy tube, 

 and its walls consist, from within outward, of a mucous, sub- 

 mucous, muscular, and fibrous coat. 



The mucous coat is lined with stratified columnar epithe- 

 lium, ciliated for a short distance at the beginning of the vas, 

 but non-ciliated in the remaining greater portion of the canal ; 

 the epithelium rests on a tunica propria, which is surrounded 

 by submucous areolar tissue. The mucosa is thrown into 

 longitudinal folds in the va, and in the ampulla into irregular 

 ruga? and plications. Small glands occur in the mucosa in 

 the ampulla. 



The muscular coat is composed of an inner circular and outer 

 longitudinal layer of involuntary muscle, intermingled with 

 fibrous tissue. Outside the muscle is a layer of fibrous and 

 areolar tissue. 



The seminal vesicle is a sacculated pouch, largely of glandu- 

 lar character, branching off from the vas deferens. Its outlet 



12 Hist. 



