THE SEXUAL ORGAN 5. 



619 



corresponding in structure, in all respects, with other fibrous membranes 

 (the dura mater especially), and everywhere surrounding the paren- 

 chyma of the testis as a closed capsule. Its external surface, except 

 where the epididymis is attached to the testis, is rendered smooth and. 

 glistening by a special covering, the tunica adnata, whilst the internal 

 is united with the substance of the gland by a thin layer of loose con- 

 nective tissue, and moreover, sends a considerable number of processes 

 into the interior; of which, the most important is the corpus Highmori 



Fi-. 257 



s. mediastinum testis, a vertical lamella of dense connective tissue ;f-l 

 inch long, and thick at its commencement, which extends from the pos- 

 terior border of the testis to a depth of 3-4 lines into the interior (Fig. 



Fig. 255. — Transverse section tliroujrli tlie right testis and its tnnics, in Man : a, I. vaginalis 

 co))wmnis : b, t. vaginalis propria, outer lamella; c, cavity of the /. v. propria, which docs not 

 exist in life; d, inner lamella of the t. v. propria (adnata), coalescent with e, the /. albnginea; 

 f, continuation of the t. propria on the epididymis, g ; h, corpus Highnwrianum : i i i, branches 

 of the spermatic artefy ; k, vena spermalica interna ; I, vas deferens ; m, artery of the vas defe- 

 rens; n, lobuli testis; s, septula. 



Fig. 25G. — Diafrram of the course of a spermatic tubule. 



Fig. 257. — Human testis and epididyi7iis, afier Arnold: a, testis; 6, lobes; r, ductuli recti: 

 d, rete vascidosum ; e, vascula effcrentia ; f coni vasculosi; g, epididymis ; h.vas deferens; i, vag 

 aberrans ; »?i, branches of the spermatica hiterna of the testis and epididymis ; n, ramification oa 

 the testis; a, art. defcrentialis ; p, anastomosis with a branch of the spermatic. 



