514 



MAMMALIA. 



constitute the epididymis, and lead into the two vasa deferentia, 

 which, after forming glandular dilations (seminal vesicles), open 

 close together into the urethra. At this point open the ducts of 

 the prostates, which differ much in form, and are often divided 

 into several groups of glands. Further down a second pair of 



glands, known as Cow- 

 per's glands, opens into 

 the urethra. Remains of 

 the miillerian ducts, which 

 in the female are used as 

 the oviducts, frequently 

 persist between the open- 

 ings of the vasa deferen- 

 tia. They are called the 

 organ of Weber (uterus 

 masculinus), and in the 

 so-called hermaphrodites 

 their parts are much en- 

 larged, and may be dif- 

 ferentiated in the manner 

 peculiar to the female sex. 

 In all cases the end of the 

 urethra, which functions 

 as a urinogenital canal, is 

 in connection with ex- 

 ternal copulatory organs : 

 these alwayshave the form 

 of an erectile penis, which, 

 in the Monotremata, is 

 concealed in a pouch in 

 the cloaca. The penis 

 is supported by cavernous 

 erectile bodies, which in 

 the Monotremata are con- 

 fined to paired corpora 

 cavernosa urethrae ; but in all other Mammalia there are, in 

 addition to the corpus cavernosum urethrae (c. spongiosum) 

 which is unpaired and surrounds the urethra, two upper corpora 

 cavernosa penis, which are attached to the ischium, and only 

 rarely fuse with one another. A cartilaginous or bony support, 



Flo. 269. Urinary and sexual organs of Cricetus 

 vulgaris (after Gegenbaur). Cp corpora cavernosa 

 penis ; Cu corpu3 cavernosum urethrae ; E glans 

 penis ; F funiculus spermaticus (spermatic cord) ; 

 Gc Cowper's glands ; Gt Tyson's glands ; H urinary 

 bladder ; N epididymis ; Pp prepuce ; Pr pros- 

 tate ; R kidney ; Sq urogenital sinus (urethra) ; 

 T testis ; U ureter ; Vd vas def erens ; Vs vesiculae 

 seminales. 



