WOLFFIAN BODY 



181 



accessory parts of the reproductive apparatus. The Wolffian duct lies external 

 to the Wolffian body, enclosed in a fold of the peritoneum, which fuses posteriorly 

 with that of the opposite side to form the genital cord (see below). 



mesenchyme 



Mitlpi/jhian 

 body 



r/.t.v/v// lnin r 



L..^ ... parietal layer 

 H, of Bowman's 

 ' '. capsule 



genital ridge 



FIG. 227. RECONSTRUCTION OF A WOLFFIAN TUBULE OF A HUMAN EMBRYO OF 

 10'2 MM. LONG. (From Kollmann.J x 260. 



Wolffian 



hind-gut 



bladder 



cloacal membrane 



cloaca 



outer zone 

 _ inner zone 



pelvis of 

 kidney 



FIG. 228. THE PRIMITIVE PELVIS OF THE KIDNEY, FROM A RECONSTRUCTION. (After Schreiner.) 



The pelvis is surrounded by nephrogenetic tissue differentiated into an inner epithelial 

 and outer mesenchymatous zone. 



Origin of the tubules. The intermediate cell-mass becomes differentiated (in the 

 rabbit-embryo, fig. 223) into an inner part adjoining the segment, which has a mesenchymatous 



