454 SPLANCHNOLOGY, OR ANATOMY OF THE VISCERA 



named the crista urethrse, collieulus seminalis, verumontanum, 

 and caput gallinaginis. On each side of it is a groove, the 

 prostatic sinus, the floor of which presents the orifices of the 

 numerous prostatic ducts. 



In the forepart of the verumontanum is a depression, which 

 leads into the sinus pocularis, or uterus masculinus, upon or 

 within the margins of which are the orifices of the ejaculcdory 

 ducts. This sinus forms a cul-de-sac running in the verumon- 

 tanum and beneath the middle lobe of the prostate. 



The membranous portion lies between the apex of the prostate 

 and the bulb of the corpus spongiosum, and is the narrowest 

 part of the canal. It is f inch long. It pierces, lies between, 

 and is invested by the anterior and posterior layers of the 

 deep perineal fascia, and is surrounded by the compressor 

 urethra?, one of Cowper's glands lying on each side. 



The spongy portion of the urethra is enclosed by the corpus 

 spongiosum, and is about 0-| inches long. The bulbous portion, 

 or sinus, is dilated, but beyond the bull) the urethra is of 

 uniform caliber as far as the glans, in which it is again dilated, 

 forming here the fosxa narirnltiri.t, and its long axis becomes 

 vertical instead of transverse. At the meatus it is much con- 

 tracted. 



The mucous membrane presents the orifices of many SIMM 11 

 racemose glands (glands of Littre) and of many Idciunr. One 

 of these latter, in the upper part of the fossa navicularis, is 

 considerably dilated, and is called the Incnnu innytui. 



Cowper's (/lands are yellowish, tabulated bodies, of the size 

 of a pea, lying between the two layers of the deep perineal 

 fascia, behind the membranous urethra, and between the 

 arteries of the bulb above and the transverse fibers of the 

 compressor urethra? below. The lobules are made up of acini 

 and joined together by fibrous tissue. The ducts from the 

 lobules unite outside the gland into a common duct, which 

 runs forward beneath the mucous membrane for about an 

 inch and opens on the floor of the bulbous portion of the 

 urethra. 



THE SCROTUM 



The scrotum is a pocket which contains the testicles and 

 part of the spermatic cords, and is marked superficially by 



