THE PENIS 



681 



both itself and its branches a tortuous course, forms the vesicula seminalis. 

 Each vesicula is a single-branching convoluted and sacculated tube. 



The structure resembles closely that of the vasa deferentia. 



The Penis. The penis is attached to the symphysis pubis by its 

 root. It is composed of three long, more or less cylindrical masses enclosed 



PIG. 489. Section of a Tubule of the Testicle of a Rat, to Show the Formation of the Sperma- 

 tozoa, a, Spermatozoa; b, seminal cells; c, spermatoblasts, to which the spermatozoa are still 

 adherent; d, aaembrana propria; e, fibro-plastic elements of the connective tissue. (Cadiat.) 



FIG. 400 Dissection of the Base of the Bladder and Prostate Gland, Showing the Vesiculae 

 Seminales and Vasa Deferentia. a, Lower surface of the bladder at the place of reflection of the 

 peritoneum; b, the part above covered by the peritoneum; i, left vas deferens, ending in e, the 

 ejaculatory duct; the vas deferens has been divided near i, 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 vesicula seminalis. which has been unraveled; p, under side or the prostate gland; m, 

 part of the urethra; u, u, the ureters (cut short), the right one turned aside. (Waller.) 



