320 



HISTOLOGY 



Connective tissue. Between the renal tubules there is a small amount 

 of interstitial connective tissue. It is more abundant toward the papillae 

 and around the vessels and glomeruli than elsewhere. Beneath the 



Lobule. 



Lobule. 



Arched col- 

 ecting tubule. 



Distal j 

 convoluted I 

 tubule. 



Papillary duct. ~ 



>..-~ Tunica fibroma. 



Stellate vein. 



Interlobular 



artery. 



- Interlobular 

 vein. 



Arcif orm artery 



Arcif orm vein. 



Interlobar artery. 

 Interlobar vein. 



FIG. 317. DIAGRAM OF THE COURSE OF THE RENAL BLOOD VESSELS. 



epithelium of the tubules it forms basement membranes, apparently 

 homogeneous, but actually composed of fine fibrils. The normal amount 

 of interstitial tissue should be carefully studied, since its increase is indica- 

 tive of an important pathological condition. This tissue is continuous 



