596 



ABDOMEN 



The delicate ejaculatory ducts pierce the base of the 

 prostate a short distance behind the internal urethral orifice 

 of the bladder, and, as they descend, they separate the 

 so-called middle lobe from the remainder of the gland, which 

 is generally spoken of as consisting of two lateral lobes, 

 though there is no structural demarcation between them. 



Vesiculse Seminales. The two seminal vesicles lie between 

 the fundus of the bladder and the rectum. Each is about 

 two inches (50 mm.) in length and is conical or piriform in 

 shape. The lower pointed end of each vesicle rests on the 



Internal urethral 



orifice 



Trigone of bladder 



Ureter 



Ductus deferens 



Ureter - 



Seminal vesicle 



Rectum 



FIG. 240. Horizontal section through the Bladder and Rectum at the level 

 at which the ureters enter the bladder. 



base of the prostate, and the blunt upper end lies in the 

 sacro-genital fold of peritoneum in relation with the recto- 

 vesical excavation of peritoneum, and with the entrance of 

 the ureter into the bladder. At their lower extremities 

 the vesicles are separated from each other only by the inter- 

 posed deferent ducts, but they diverge as they ascend, and 

 their upper ends are wide apart. They are enclosed, together 

 with the deferent ducts, which lie along their medial sides, 

 in a dense sheath derived from the recto-vesical layer of the 

 visceral pelvic fascia. 



Each vesicula seminalis is in reality a closed tube, five or 

 six inches long, which is coiled upon itself and bound into 

 vesicular form by the dense areolar tissue in which it is 



