492 



THE MALE GENITAL ORGANS OF THE HORSE 



The vesiculse are, for the most part, retroperitoneal, but the fundus extends 

 forward into the urogenital fold and hence has a serous covering. The neck or 

 duct (Ductus excretorius) dips under the prostate, and usually unites with the 

 end of the vas deferens to form the ejaculatory duct. 



Structure. — The wall, exclusive of the partial serous coat, consists of a fibrous 



B ladder 



Round ligament 

 of bladder 



-— Lateral ligament 



of bladder 



Uro^enUol foid 



~^\ ^ -^t, cy'oj 



UreMTr<al 

 muscie 



Bulbo-urctkral {Coivper\s) gland , 



F'in. 394. LvTERNAL GENITAh Oki.ANS OF StALLION, DoRSAL ViEW. 



On left side urethral muscle has been removed over bulbo-urethral gland. Cornua of uterus raasculinus are in- 

 dicated in urosrenital fold. 



adventitia, a middle muscular coat, and a mucous lining. The muscular coat 

 is thickest at the fundus, and consists of two planes of longitudinal fibers with a 

 circular layer between them. The mucous membrane is thin, and is arranged in 

 numerous folds which form a network; the spaces so inclosed present the open- 

 ings of tubulo-alveolar glands. The epithelium is columnar. The blood-supply 

 is derived from the internal pudic artery. 



