148 EQUINE ANATOMY. 



and the pouch the third seminal vesicle (this is not present in man 

 to nearly the same extent). 



THE PROSTATE GLAND. 



The prostate is situated behind the neck of the bladder, and 

 embraces the beginning of the urethra, being divided into two 

 lateral lobes. It contains a number of conglomerate glands, 

 whose secretion is poured into the urethra on the sides of the 

 veru montanum. It also contains fibrous structure. 



THE URETHRA. 



This is an elongated canal continuing through the whole penis, 

 and beginning at the neck of the bladder as the meatus internus. 



It "first passes backward, curves around the ischial symphysis, 

 and then downward and forward in the structure of the penis, 

 between the two corpora cavernosa. 



Divisions. 



Prostatic region, dilated, contains veru montanum, sinus pocu- 

 laris, and openings of prostatic glands. 



Membranous, from prostate to beginning of the spongy tissue 

 (corpus spongiosum). 



Spongy or extra pelvic. 



Begins near exit from pelvis, is narrowed and terminates on the 

 glans, as the urethral tube. Just before this, it is dilated, the 

 fossa navicularis. Behind the prostate are also the openings of 

 Cow per' s glands. 



Structure. 



Mucous membrane, thin and covered by columnar epithelium; 

 in some parts flattened. 



Erectile tissue. 



Commences at ischial symphysis as the bulb, spreading out in 

 front to form the glans penis, into which the cavernosa are in- 

 serted. 



Its structure consists of fibrous spaces with some elastic tissue, 

 which cause erection mechanically, by their distention with blood. 

 (For muscles see Perineum.} 



COWPER'S GLANDS. 



These are two in number, of about the same structure as, and 

 smaller than the prostate, situated near the outlet of the pelvis, on 

 each side of the urethra, and throwing their secretion into it. 



