THE SEXUAL ORGANS. 221 



( Diss, de glandulis suprarenal/ c. tab. Gott., 1839 ; A. Ecker, 

 1 Der feinere Bau der Nebennieren beim Menschen/ u. den 4 

 ' Wirbelthierclassen/ Braunschweig, 1846, und Art. f Blutge- 

 fassdriisen/ in Wagner's ' Handw. d. Physiologie/ Bd. IV, 

 18-19 ; H. Frey, Art. ' Suprarenal Capsules/ in Todd's ' Cyclop, 

 of Anat./ Oct., 1849. 



[H. Gray, ' On the development of the ductless Glands in 

 the Chick/ < Phil. Trans./ 1852.— Eds.] 



OF THE SEXUAL ORGANS. 



A. MALE SEXUAL ORGANS. 

 §196. 



The male sexual organs consist. 1. Of two glands for the 

 secretion of the semen, the testes, which, together with special 

 tunics, the tunica vaginales, are contained in the scrotum; 

 2. of their efferent canals, the vasa deferentia and ejaculatory 

 ducts with their appendages, the vesicular seminales ; 3. of the 

 copulatory organs, the penis and its muscles ; 4. and lastly, 

 of special accessory glands, the prostate and Cowper's glands. 



§ 197. 

 The testicles, testes, are a couple of true glands, containing 

 within a special tunic, the tunica albuginea s. fibrosa, the 

 secreting elements, in the form of complexly convoluted 

 tubules, the spermatic tubes or tubuli seminiferi. The tunic is 

 a white, dense and thick membrane, corresponding in structure, 

 in all respects, with other fibrous membranes (the dura mater 

 especially), and everywhere surrounding the parenchyma 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 connective tissue and moreover, sends a con- 

 siderable number of processes into the interior ; of which, the 

 most important is the corpus Highmori s. mediastinum testis, 

 a vertical lamella of dense connective tissue § — 1" long, and 

 thick at its commencement, which extends from the posterior 



