408 



DISSECTION OF THE PELVIS. 



and a mu- 

 cous coat. 



(the base of the bladder being upwards), and are strongest near the 

 prostate, acting most on the vasa deferentia. The longitudinal 

 fibres, placed chiefly on the sides of the vesiculse, are continued 

 forwards with the common seminal ducts to the urethra. (Roy. 

 Med. Chir. Trans. 1856.) 



The mucous membrane is thrown into ridges by the bending of 

 the tube, and presents an alveolar or honeycomb appearance ; it is 

 provided with tubular glands, as in the vas deferens. 



FIG. 151. THE POSTERIOR SURFACE OP THE BLADDER, WITH THE 



SEMIXALES AND VASA DEFERENTIA (SLIGHTLY ALTERED FROM HALLER). 



a. Bladder. 



b and c. Right and left lateral 

 lobes of the prostate. 



d. Middle lobe. 



e. Vesicula seminalis, the right one 

 unravelled. 



/. Vas deferens. 



g. Common seminal duct, formed 

 by the union of the vas deferens with 

 the duct of the vesicula. 



h. Ureter. 



End of vas 

 deferens. 



Seminal 

 ducts, how 

 formed : 



extent ; 

 course ; 



End of vas deferens (fig. 151). Opposite the vesicula the vas 

 deferens is enlarged, and is rather sacculated like the contiguous 

 vesicle ; but before it joins the tube of that body to form the 

 common seminal duct, it diminishes in size, and becomes straight. 

 In the mucous lining are numerous tubular glands (Henle). 



Common ejaculatory ducts (fig. 151, (/, and fig. 153, /, p. 412). 

 These tubes (right and left) are formed by the junction of the 

 narrowed part or duct of the vesicula seminalis with the vas deferens 

 of the same side. They begin opposite the base of the prostate, and 

 are directed downwards and forwards through an aperture in the 

 transverse prostatic fibres, and along the sides of the uterus masculinus 



