THE URO-GENITAL SYSTEM 



capsule. The first convoluted tubule is lined with irregular cuboidal 

 or pyramidal epithelial cells. The descending limb of Henle's loop 

 is narrow and is lined with a simple layer of flat epithelial cells.____In 



A. i 



tubule. 



3, Collecting 



FIG. 53. The renal structure. 



Capillary blood-vessel. 2, Descending limb of Henle. 

 4, Ascending limb of Henle. 



B. i, Branch of renal artery. 2, The descending or medullary branch. 3, 

 The ascending branch. 4, The arteriole taking part in the formation of the 

 glomerule. 5, The glomerule. 6, Bowman's capsule. 7, Blood-vessel extending 

 from the glomerule. 8, The vein of the medullary part of the lobule. 9, The 

 neck. 10, The convoluted tubule, n, The descending limb of Henle. 12, 

 Henle's loop. 13, The ascending loop of Henle. 14, The collecting tubule. 



C. i, Section through a convoluted tubule. 2, Bowman's capsule. 3, The 

 glomerule. 



the loop the epithelium changes from the flat type in the descending 

 limb to the cuboidal in the ascending limb. The ascending limb of 

 Henle's loop again becomes broader and is lined with low cuboidal 

 cells. The second convoluted, or tortuous, tubule is lined with low 



