WOLFFIAN BODY 



179 



become prominent bodies, which increase in size until the eighth week, after which 

 they gradually diminish owing to the fact that the tubules undergo degenerative 

 changes. These degenerative changes commence at an early stage in the head end 





%* ?; 



#~^:.% 



uv 





*v:; 



'Si 



V 



FK;. 224. TRANSVERSE SECTION* THROUGH THE TRUNK OF A RABBIT-EMBRYO OF THE ELEVENTH DAY 



(T. H. Bryce.) 



me, muscle-plate; cp, skin-plate of segment; sc, ' sclerotome ; w.d., Wolffian duct; w.t,, Wolffian 

 tubxile. The ridges in which the ducts and tubules lie are the Wolffian ridges. To the left the section 

 has cut the wall of a Wolffian tubule where it is connected by a cellular cord with the ccelomic 

 epithelium. A, aorta; (7, coelom ; U.V., U.V., umbilical veins. 



primary coils of Wolffian tubuJe 

 9 



\\'i [ffian duct 



Bowman'i 



capsule 



Fie;. 225. TRANSVERSE SECTION OF A WOLFFIAN TUBULE IN THE TWENTY-NINTH SEGMENT 



OF A RABBIT EMBRYO AT A LATER STAGE THAN THAT REPRESENTED IN FIG. 224. (After 



Schreiner.) x 195. 



N2 





