THE SEXUAL ORGANS. 



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 



Fig. 257. 



s. mediastinum test-is, a vertical lamella of dense connective tissue f 1 

 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 through the right testis and its tunics, in Man : cr, t. vaginalis 

 communis ; 6, t. vaginalis propria, outer lamella; c, cavity of the t. v. propria, which does not 

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

 /, continuation of the t. propria on the epididymis, g ; h, corpus Highmorianum ; i i i, branches 

 of the spermatic artery; k, vena spermalica interna; I, vas defercns ; m, artery of the vas defc- 

 rens; n, lobuli testis ; s, seplula. 



FIG. 25G. Diagram of the course of a spermatic tubule. 



FIG. 257. Human testis and epididymis, after Arnold: a, testis ; b, lobes; c, ductuli recti 

 d, rele vasculosum e, vascula ejferentia ; f, coni vasculosi ; g, epididymis; h,vas deferens ; i, vas 

 aberrans m, branches of the spermatica interna of the testis arid epididymis n : ramification on 

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



