STRUCTURE OF THE KIDNEYS. 



391 



parts essentially differing from one another both in their structure 

 and in their relation to the blood vessels. 



The tubes begin by a small, rounded dilatation (Malpighian 



FIG. 171. 



FIG. 172. 



Fio. 171. Diagram of the Tubules of the Kidney. (Cadiat.) a. 1-aiye duct opening 

 at papilla, ft and c. Straight collecting tubes, d and e. Looped tubule of Henle. /. 

 Convoluted tubules of cortex, g. Capsule from which the latter spring. 



FIG. 172 Portions of various Tubules highly magnified, showing the relation of the 

 lining epithelium to the wall of the tube. (Cadiat.) a. Large duct near the papilla. 6. 

 Commencement of Henle's loop. c. Tliin part of Henle's loop. 



.capsule), which is lined by thin, flattened epithelium. Opening 

 from this capsule, Fig. 171 (g), is found a tortuous tubule (/), 

 lined by peculiar, large, rod-beset epithelial cells, which occupy 



