THE SEXUAL ORGANS. 



223 



is from 13" to 33". At the pointed extremity of each lobule the 

 spermatic canals become straighter, when each by itself, or the 

 two or three arising in 

 one lobule united into a 

 simple canal, enter as the 

 ductuli recti, l T l s '" in dia- 

 meter (fig. 257c), the base 

 of the corpus Highmori, 

 where they form a very 

 close plexus, 2 — 3'" broad 

 and V{" thick, and ex- 

 tending the whole length 

 of that body, — the rete 

 testis (r. vasculosum Hal- 

 leri) (fig. 257 d). From 

 the upper end of this 

 plexus, the canals in which 

 measure from ^ to ^'" 

 (0-03— 0-08'"), proceed 

 7 — 1 5 efferent canals, 

 vasa efferentia testis s. 

 Graafiana, of j — f (016 

 — 0-18'") (fig. 257 e), 

 which, traversing the t. albuginea are continued into the 

 epididymis. Here they contract to J'" and ±?" ', are convoluted 

 in exactly the same way as the spermatic canals in the lobuli 

 testis, but without presenting divisions or anastomoses, and 

 thus produce a certain number of conical bodies, the 

 apices of which are directed towards the testis, — the spermatic 

 cones (coni vasculosi s. corpora pyramidalia) (fig. 257 /). 

 These cones, united together by connective tissue, constitute 

 the head (globus major) of the epididymis, at the upper and 

 posterior border of which their canals gradually coalesce ; and 

 thus is formed the simple thick duct of the epididymis, 0*16 

 — 0-2"' in diameter (fig. 257, g). This duct, convoluted in a 



Fig. 257. Human testis and epididymis, after Arnold: a, testis; b, lobes; c, 

 ductuli recti ; d, rete vasculosum ; e, vascula efferentia ; f, coni vasculosi ; g, epidi- 

 dymis ; h, vas deferens; i, vas aberrans ; m, branches of the spermatica interna of 

 the testis and epididymis ; n, ramification on the testis ; o, art. deferentialis ; p, 

 anastomosis with a branch of the spermatic. 



