THE KIDNEYS 



197 



These cups are drained by tubes which follow winding 

 paths through the kidney tissue. At one point in their 

 course, they are surrounded by a fine network of capil- 



Diaphragrrt 



Supra-renal 

 capsule 



kidney 



Bladder 



FIG. 108. The kidneys and principal blood-vessels of abdomen, as seen when 

 intestines are removed. 



laries. They ultimately join together to form large 

 drainage canals, which empty into a cavity on the inner 

 or concave side of each kidney. This cavity is connected 

 by means of a slender tube, the ureter, with an elastic 



