TEE GENITAL ORGANS OF THE MALE. 



979 



developetl, and presents, internally, a longitudinal fibrous cord ; it is not much dilated during 

 erection. In this act, the penis is elongated hy tlic straiglitening out of its curvatures, rather 

 tluiu by any real lengthenings ; when erection ceases, the organ is retracted into the preputial 

 cavity by the contraction of tlie suspensory ligaments, which reform its double iulleetiou l>ehiml 

 the scrotum. ^^^ 



In the Ram, the disposition of the testicles and vasadefCTUna is somewhat similar. The 

 membranous portion of the uiethra has no prostate, but quite posteriorly it lias two sioall 

 C'owper's gland.s, the. upper face of whicli is covered by a red muscular layer that leaves the 

 origin of the bulbous portion and is lost on this surface. Tlie muscles are disposed as in tlie 

 Bull. But the sf)ongy portion of the urethra is not enveloped by the corpus cavernosum, 

 which is channeled, as in Solipeds, by a furrow that lodges the urethra. The iiead of the 

 penis is remarkable for two lateral folds, disposed like wings at the base of the glans. One 

 of these is only slightly developed, so that the head of the penis looks asymmetrical. The 



Fig. 527. 



PENIS AND MUSCLES OF THE PREPUCE OF THE BULL. 



1, Protractor muscle of the prepuce; 2, retractor of ditto; 3, testicles in the scrotum ; 4, the -S of 

 the penis; 5, suspeasory ligaments of the penis attached to the second curve; tl, subcutaaeous 

 abdominal vein. 



nrethra isal^o prolonged by a vermiform appendix from 1 to U inches long. (In the Tlam, the 

 extremity of the urethra bus tiie form of a narrow cylinder curved backwards, its opening being 

 a longitudinal slit. In Ruminants, towards the extremity of the prepuce are small teats; 

 these, in the He-goat, are sometimes glandular, and secrete a fluid analogous to milk.) 



Pig. — The testicleit of this animal are round, and placed in the perinaeal region. The 

 scrotum is narrow, and but liitle detached : the pouches of which it is composed appearing 

 simply as two hemispherical prominences on the surface of the perinfeum. There is nothing 

 particular to be remarked in the epididymis and vas deferens; (the tail of the first is very 

 voluminous; the latter has no pelvic dilatation ) 



The resiculai seviinales, with regard to disposition, are intermedinte between those of the 

 Horse and Ox. Their walls are thick and very glamluhir, and their interior is diveiticulated. 

 (They are, proportionately, very large, and, in structure, closely resemble those of Ruminanta; 



