iv THE GENEEATIVE SYSTEM OF THE MALE 123 



membrane composed of closely interwoven elastic fibres ; it 

 contains internally a stratified epithelium, and externally has a 

 network of capillary vessels. 

 The stratified epithelium 

 consists of cells of two 

 different kinds the seminal 

 cells and the cells of Sertoli. 

 The first are disposed in 

 different strata which corre- 

 spond to different genera- 

 tions of these elements; the y --~w 

 second occupy all the surface 

 of the epithelium and are 

 intercalated between groups 

 of seminal cells. When the 

 testicle, owing to the early 

 age of the subject, is not 

 yet in sexual activity, the 

 cells of Sertoli are numer- 

 ous, and have the appear- 

 ance of a simple cylindrical 

 epithelium ; on the other 



pViPTi <spvnal antivirv Fio. IS. Transverse section through middle of right 



Vnen SeXUai activity testicle with epididymis and spermatic cord.^1, 



there is Observed a tunica albuginea ; 2, parenchyma of testicle (lobules) ; 



-, . , . . , , 3, septa of testicle ; 4, mediastinum ; 5, body iof 



multiplication OI the Sexual epididymis; 6, spermatic cord ; 7, veins of the cord ; 



nc\\a TirV.irtVi Q^Q inf nvi-ir>oQrl 8 > vas deferens ; 9, cavity of tunica vaginalis; 9', 



Oeilb WlllCll dre mierpOStJU interior of epididymis ; 10, tunica vaginalis propria 



among the Cells Of Sertoli, (parietal lamina) ; 11, tunica vaginalis communis. 



*Fio. 19. Diagram of a sagittal section to show the structure of the testicle and epididymis. 1, 

 tunica albuginea ; 2, septa ; 8, mediastinum ; 4, lobule ; 5, convoluted seminiferous tubules ; 

 6, straight tubules ; 7, rete testis ; 8, efferent ductules ; 9, coni vasculosi ; 10, 10, appendices of 

 the rete ; 11, duct of the epididymis ; 12, vas aberrans inferior ; 18, vas deferens ; 14, para- 

 didymis. 



