THE URO-GENITAL SYSTEM 



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capsule. The first convoluted tubule is lined with irregular cuboidal 

 or pyramidal epitheUal cells. The descending hmb of Henle's loop 

 is narrow and is lined with a simple layer of flat epitheUal cells. In 



Henle. 3, Collecting 



Fig. S3. — The renal structure. 



A. I, Capillary blood-vessel. 2, Descending limb of 

 tubule. 4, Ascending limb of Henle. 



B. I, Branch of renal artery, j. 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 ejstending 

 from the glomerule. S, The vein of the meduBary part of the lobule. 9, The 

 neck. 10, The convoluted tubule. 11, The descending limb of Henle. 12, 

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



C. 1, 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 hned with low cuboidal 

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



