THE TESTICLES. 



317 



a series of small, conical masses, which together constitute 

 the globus major, or head of the epididymis. Each of these 

 tubes, when unravelled, is from six to eight inches long, 

 gradually increasing in diameter, until they all unite into a 

 single, convoluted tube, which forms the body and the glo- 

 bus minor of the epididymis. This single tube of the epi- 

 didymis, when unravelled, is about twenty feet in length. 



FIG. 30. 



Testicle and epididymis of the human subject. After Arnold. a, testicle ; &, lobules of the 

 testicle; c, vasa recta: d, rete testis ; e, vasa efferentia; /, cones of the globus major of the 

 epididymis; g, epididymis; 7i, vas deferens; *, vas aberrans; m, branches of the spermatic 

 artery to the testicle and epididymis ; n, ramification of the artery upon the testicle and 

 epididymis; o, deferential artery; p, anastomosis of the deferential with the spermatic 

 artery. (KOLLIKER, Handbuch der Gewebele/ire, Leipzig, 1867, S. 528.) 



The walls of the seminiferous tubes in the testicle itself 

 are composed of connective tissue, a basement-membrane, 

 and a lining of granular, nucleated cells. In the rete testis, 

 it is uncertain whether the tubes have a special fibrous coat 



