THE KIDNEY. 



123 



The tube suddenly narrows (-g-ginr ")> becomes straight, and passes 

 into a pyramid of Malpighii. It reaches sometimes just into the pyramid , 

 more frequently, however, passing deeper than this often descending 

 two-thirds of the distance to the apex; and is called the descending 

 limb of Henle. Henle's descending limb suddenly turns upon itself, 



FIG. 86. DIAGRAM SHOWING THE DIVISIONS OP A KIDNEY TUBULE. 



forming a loop; and, widening ( T oVg- ")> returns upon its course as 

 the ascending limb of Henle. It again enters the cortex, keeping in a 

 pyramid of Ferrein, and passes outward until it approaches the outer 

 limit of the cortex, near the capsule of the kidney. Here the ascend- 

 ing limb of Henle widens (-5-^3- ")> forming the distal convoluted, 

 which pursues a tortuous course in the outer cortex. The distal con- 



