THE ACCESSORY REPRODUCTIVE ORGANS 259 



Ruminants. In the sheep, the gazelle, the giraffe, and a number 

 of antelopes, there is a long filiform process attached to the end of 

 the organ and traversed by the urethral passage. In some forms the 

 process arises medially (the penis being symmetrical) ; but in others, 

 such as the sheep, it is attached to the left side of the organ, the 

 distal end of which appears to have undergone some sort of torsion.^ 



Fig. 70. — Distal end of rain's penis, as seen from J;he left side, showing 

 glans and filiform appendage. The prepuce is folded back. Slightly 

 reduced. 



Th^ urethra opens to the exterior at the extreme end of the filiform 

 appendage. This structure — which has been investigatesd, especially 

 in the ease of the sheep ^ — is composed largely of erectile tissue 



Bl. V. 



Fibr. Cart. 



Fig. 71. — Transverse section through filiform appendage of ram, about 

 a quarter its length from the tip. x 45. 



Bl. v., Blood-vessels ; Ep. Ur., epithelium surrounding urethral cavity ; 

 Fibr. Cart., fibro-cartilage ; Int., integument ; Mvm., muscular layer ; 

 Ur., urethra. 



which surrounds the urethra, and may be regarded as an extension 

 of the corpus spongiosum. Outside the erectile tissue is a well- 

 marked muscular layer which lies next to the integument. The 

 process is supported by a pair of fibro-cartilage bodies, placed one on 

 each side of the urethra and extending throughout the whole length 

 of the structure. 



' Garrod, "Notes on the Osteology and Visceral Anatomy of Euminants," 

 Proc. Zool, Soc, vol. xlv., 1877. For other orders see below, pp. 261 and 272. 



^ Nicolas, "Sur I'Appareil Copulateur du Bdlier," Jour, de I'Anat. et la 

 Phys., vol. xxiii., 1887. Marshall, "The Copulatory Organ in the Sheep, "^. 

 Ariat. Am., vol. xx., 1901. 



