168 



THE ESSENTIALS OF HISTOLOGY 



convoluted tubules, into which these pass. On the other hand, the 

 functional tubule has a large lumen and is lined by clear flattened 

 cells, and the collecting tubes have also a very distinct lumen and are 

 lined by a clear cubical or columnar epithelium (figs. 201, d; 204, a). 



FIG. 205. SECTION ACBOSS A PAPILLA OF THE KIDNEY. (Cailiat.) 

 , large collecting tubes (ducts of Bellini) ; b, c, d, tubules of Henle ; e,f, blooJ-capillaries. 



The following gives a tabular view of the parts which compose a 

 uriniferous tubule, and the nature of the epithelium in each part : 



