320 



OSWALD S. LOWSLEY 



other and binding them intimately together. This is the condi- 

 tion which Pallin believes to exist in all prostate glands. 



The two lateral lobes are composed of 42 distinct tubules which 

 have numerous and large branches. These structures all extend 

 laterally, posteriorly, and towards the bladder, their uppermost 

 branches being found under the lower end of the vesical sphincter. 

 The muscular layers around the tubules, the development of which 

 has already been referred to, are very prominent in this specimen, 

 particularly where the tubules are beginning to push out laterally 

 and posteriorly to form the bulging lateral lobes. 



Ventral lobe lubules. 



Urethra. 



Utricle Prostalicus. 

 Ejaculatory Dud. / y^ ;^^%^ Ejaculaloru Duct. 



Fie. 6 19 cm. human fetus. Five and one-half months. 



Below the entrance of the ejaculatory ducts and utriculus pros- 

 taticus there are observed ten large branching tubules which ex- 

 tend back behind the structures mentioned above and between 

 and behind the lateral lobe tubules. These tubules compose the 

 posterior lobe of the prostate and make up the main mass of its 

 apex, being distinctly separated from the two lateral lobes by a 

 considerable area of tissue. The posterior lobe does not extend 

 very far up behind the ejaculatory ducts in this specimen on 

 account of the huge size of the utriculus prostaticus which occu- 

 pies the space into which the tubules of this portion of the gland 

 usuallv extend. 



