MALE ORGANS OF PERISSODACTYLA. 



665 



/, 



e. 



522 



it is prolonged forward, to terminate in the prepuce, ib 

 The testis, ib. g, is of a sub- 

 compressed ovoid form, the 

 epididymis, h, /, rather closely 

 attached to the testis and not 

 longer than the gland. Thevas 

 deferens, m, enlarges at its ter- 

 minal part,ib. 0,0, and fig. 523, 



a, a, by the development of 

 its inner tunic into numerous 

 close-set transverse glandu- 

 lar lamellae. The vesicular 

 glands, fig. 522, x, x, fig. 523, 



b, b, are simple bladders with 

 thin walls. In the transverse 

 fold of peritoneum connecting 

 together the enlarged parts 

 of the sperm-ducts is situated 

 the protometra, fig. 523, c, in 

 form of a slender elongate 

 tube, bifurcate, in the Zebra 

 and Ass, at its blind end. 1 

 The prostates are parenchy- 

 matous, and open into the 

 upper or vesical end of the 

 muscular tract of the urethra : 

 at the lower end of this part 

 are the Cowperian glands, fig. 522, y,y-> which open into the bulb 

 of the urethra. 



The corpus cavernosum penis is formed by confluence of that of 

 the two crura, into one body, without vertical septum, i the parts 

 composing its cells appear muscular to the eye, and in a Horse 

 just killed they contract on being stimulated.' 2 The fibrous tissue 

 here noticed lies between the vascular and sclerous parts of the 

 cells. The glans has two lateral semilunar lobes, and at its apex 

 a central pyramidal process on which the urethra opens. The 

 ' crura penis ' are surrounded by thick [ erectores,' having an ex- 

 tensive origin, fig. 524, d: two strong suspensory ligaments, ib. a, 

 pass from the symphysis pubis to the dorsum. Besides the ordi- 

 nary muscles, there is a pair of small ' levatores,' ib. b, c 

 mainly as compressors of the vena dorsalis penis, ib. e 

 1 xx. vol. iv. p. 93. 2 xciv. p. 30. 



Male organs, Horse. 



, serving 

 there is 



