326 OSWALD S. LOWSLEY 



communicate with the vasa deferentia behind the lower part of 

 the sphincter of the bladder rather deeply in the base of the pros- 

 tate gland. 



The ejaculatory ducts surrounded by their thick muscular wall 

 and imbedded in the prostate traverse its posterior portion for a 

 considerable distance in a plane horizontal with the floor of the ure- 

 thra. A little below the point where the lowest of the middle lobe 

 tubules opens out upon the floor of the urethra the ejaculatory 

 ducts turn sharply and mount almost perpendicularly towards the 

 urethra and with their thick coats and the utriculus prostaticus 

 form the verum montanum. By referring to fig. 4 it is seen that 

 the relative sizes of the urethra, the verum montanum and its 

 contained structures are much smaller in the older specimen 

 when compared with the size of the prostate gland. The ejacula- 

 tory ducts, which are greatly narrowed here, run for a considerable 

 distance in the verum montanum parallel with the axis of the 

 urethra and finally open on the sides of the verum montanum. 

 The course of the ducts in this compressible structure and their 

 lateral openings which are very small in size, are the features 

 which make total occlusion of these important structures possible 

 in case of distention of the prostatic urethra from any cause. 



The utriculus prostaticus is about the size of an ejaculatory 

 duct in this fetus. Its uppermost end begins at the point where 

 the ejaculatory ducts assume their position in the verum monta- 

 num and extends outward in the apex of that structure opening 

 in the middle line near the apex of the prostatic urethra. Outer- 

 ward from the mouths of the ejaculatory ducts the utricle is sur- 

 rounded by a thick muscular wall which includes a continuation 

 of the fibers which surrounded the ejaculatory ducts. Below the 

 mouth of the utricle the muscular tissue continues for a short dis- 

 tance only. 



New-born infant: (35 cm.) 



The bladder and prostate of an infant who had died a few days 

 after birth were cut in cross section and mounted in the usual way, 

 being stained with haematoxylin and eosin. A very thorough 

 study has been made of the prostate of this baby, which has in- 



