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 



Arched collecting 

 tubule 



Vas afferent Vas efferens 



Intercalary (dis- ) 

 tal convoluted) V 

 segment ) 



Proximal conto- 

 luted segment 



Renal corpuscle 



Vasa arci/ormia 



Stout, clear por- ) 



tion of loop of [ 



Henle ' \ 



Interlobar 

 blood-vessels 



Stout,cloudy por- 

 tion of loop of 

 Henle 



Slender, clear) 

 portion of loop V 

 of Henle } 



Henle' s loop 



Large, straight 

 collecting in- 

 bule ) 



Glomerulus 

 Cortex 



i Straight, colli-ct- 



( ing tubule 



Interlobular vein 

 Interlobular artery 



Arteriola recta 

 Outer stripe 



< Outer zone of 

 t medulla 



Inner stripe 



5 Inner zone of 

 i 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 : 



