THE UEO-GENITAL SYSTEM. 115 



occurs and shows the real nature of the sinus pocularis. The 

 vagina, uterus, and part of the Fallopian tubes can be recognised 

 (Primrose). 



bladder 



ejac. ductMMf fM&Z 



ejac. duct, 

 from W.D. 



sinus pocularis 

 from M.D. 



tow uro-genital sinus. 



triang. lig. 



Fra. 90.— A section of the Prostate showing the Hemnants of the lower ends of the 

 Mttllerian Ducts in the male. 



bladder 



uterus 



Fallop. 

 tube 



4 ejac. 

 uagma \duct. 



triang. lig. 



Fig. 91.— A section of a Prostate showing an unusually developed Uterus Masculinus. 

 (After Primrose.) 



The fimbriated ends of the Miillerian ducts persist as the 

 sessile hydatids on the testicle (Fig. 82). The intermediate part 

 of the tube becomes greatly stretched during the descent of the 

 testicle and disappears, but a remnant of its upper end can be 

 found in the sharp anterior border of the epididymis until quite a 

 late period in foetal life (J. H. Watson). The mesosalpinx 

 shrinks and completely disappears in the anterior border of the 

 epididymis. 



The Uro-genital Sinus or Canal. — The Miillerian ducts open 

 into that part of the cloaca which becomes the neck of the bladder 

 (Kg. 86). That part of the cloaca which serves as a common 

 channel for bladder, Miillerian, and Wolffian ducts is the uro- 

 genital sinus (Figs. 95 A and B). In the female foetus at the 

 4th month it is still well marked (Fig. 92 A). In all mammals 



