180 



UROG-ENITAL SYSTEM 



of the Wolffian body, and it is here reduced to a membranous fold which plays an 

 important part in the formation of the primitive diaphragm, and behind that 



kidney 





'^TWflHF f 



%t& 



'*'*>*V.V < J/f 



' *** * :\*t>*$ 



A* -**.*>*,'> 



w.d. 





gen. gl. 

 FIG. 226. SECTION OF THE WOLFFIAN BODY OF A HUMAN EMBBYO AT THE END OF THE FIFTH OB 



BEGINNING OF THE SIXTH WEEK. (T. H. Bryce.) 



gl, gl, glomeruli ; w.d., Wolffian duct ; w.t., w.t., Wolffian tubules ; gen.gl., genital gland. 



structure forms the diaphragmatic fold of the Wolffian mesentery. By the fifth 

 month the tubules have almost entirely disappeared, and in the end only persist as 





