428 



THE URINARY SYSTEM 



large terminal tubules, the papillary ducts, which pour the urinary 

 secretion into_the renal calyces. 



Each uriniferous tubule may thus be subdivided into several portions 



Intercalary (dis- ) 

 tal convoluted) > 

 segment } 



Proximal convo- 

 luted segment 



Renal corpuscle 



Vasa arciformia 



Stout, clear por- } 



tion of loop of > 



Henle ) 



Interlobar] 

 blood-vessels ( 



Stout, cloudy por- ", 

 tion of loop of 

 Henle 



Slender, clear~) 

 portion of loop > 

 of Henle } 



Henle's loop 



Large, straight 

 collecting tu- 

 bule 



Arched collecting 

 tubule 



Vas afferens Vas efferens 



Glomerulus 



Cortex 



5 Straight, collect- 

 l ing tubule 



Interlobular vein 

 Interlobular artery 



Arteriola recta 

 Outer stripe 



5 Outer zone of 

 ( medulla 



Inner stripe 



5 Inner zone of 

 ( medulla 



Papilla 



FIG. 400. DIAGRAM OF URINIFEROUS TUBULE OF A MAMMAL. (Adapted from 



Peter and Merkel.) 



which differ from each other, not only in their location, but also in the 

 character of their lining epithelium. The successive portions which 

 compose a single uriniferous tubule may be enumerated as follows : 



