3o6 



CHORUATE ANATOMY 



ologists to believe that the quantity of water excreted by the renal 

 corpuscles is many times greater than that which finds its way through 

 the collecting tubules into the ureter, and consequently to conclude that 

 most of this water is reabsorbed by the tubules. Their great length is 

 assumed to be an adaptation to this absorptive function. (Fig. 271) 



Renal corpuscle. Convoluted tubules. Cortical ray. 



Interlobular vein. 



/ 



Henle's loop. Arciform vein. Arciform vein. 



Fig. 272. — Part of a radial section of a human kidney. At * a renal corpuscle has 

 dropped out. Xs. (From Bremer's "Text Book of Histology.") 



Blood Supply. Arteries enter and veins leave the kidney by way of 

 the hilum on the median side of each kidney. (Fig. 271) Within the 

 renal columns, branches of the renal artery form interlobar arteries. 

 Passing between the medulla and cortex, these, in turn, become the 

 arcuate arteries, and give off branches both to the medulla and the cortex. 

 In the cortex, they are known as interlobular arteries, from which branches 

 supply the glomeruli. The arteriole which carries blood to a glomerulus 

 is larger than that which leaves the glomerulus. By this arrangement, 



