THE VESICULJE SEMINALES. 



737 



The mucous membrane lining the vesiculse seminales, 

 like that of the gall-bladder, is minutely wrinkled and set 

 with folds and ridges arranged so as to give it a finely 

 reticulated appearance. The rest of their walls is formed, 

 chiefly of a layer of organic muscular fibres, from which 

 Fig. 207.* 



they derive contractile power for the expulsion of their 

 contents. 



To the vesiculae seminales a double function may be 

 assigned ; for they both secrete some fluid to be added to 



* Fig. 207. Dissection of the base of the bladder and prostate gland, 

 showing the vesiculae seminales and vasa deferentia (from Haller). ', 

 lower surface of the bladder at the place of reflexion of the peritoneum ; 

 b, the part above covered by the peritoneum ; ', left vas deferens, ending 

 in e, the ejaculatory duct ; the vas deferens has been divided near t, and 

 all except the vesical portion has been taken away; s, left vesicula 

 seminalis joining the same duct ; s, s, the right vas deferens and right vesi- 

 cula seminalis, which has been unravelled ; p, under side of the prostate 

 gland; m, part of the urethra; u, u, the ureters (cut short near 11), the 

 right one turned aside. 



3 B 



