02 



Developinent and Shape of Uriniferous Tubules 



c '-^^^^i'vJlV-^^' 



Fig. 13. A, uriniferous tubule from the kidney of a human embryo of the 

 seventh month (No. 16). X 160. 



B, a portion of one of the sections of the series from which the preliminary 

 drawings used in making the model shown in 4 were made. X 160. M, 

 Malpighian corpuscle; dc, distal convoluted portion; pc, proximal convoluted 

 portion; dl, descending or proximal limb of Henle's loop, showing flattened 

 epithelium; c, collecting tubule; (all parts of the tubule shown in recon- 

 struction); al', ascending limb of Henle's loop of a second tubule; m', dC, dV, 

 portions corresponding to those designated with like letters without the accent, 

 belonging to a second tubule. 



