492 



THE MALE GENITAL ORGANS OF THE HORSE 



The vesiculfe 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 



Bladder 



Round ligament 

 of bladder 



Lateral ligament 

 of bladder 



( Urernral 



' ^ musc\e 



c, - 





Bulbo-tirethral {Cowper\'i) gland — 



Fig. 394. — Intern.'^l Genitai, Organs of Stallion. Dorsal View. 

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

 dicated in urogenital fold. 



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

 is thickest at the fundus, and consists of two jilanes 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. 





