758 



THE URINARY TRACT. 



newly appeared elements are united to each other by fine threads. The 

 membrana propria of the urinary tubules remains intact in this stage of the 

 inflammation. 



We find the epithelium in many urinary tubules unchanged or in a condi- 

 tion of cloudy swelling, while numerous convoluted and straight tubules are 

 entirely or partially deprived of their epithelium the desquamative nephritis 

 of authors. Wherever groups of detached epithelia fill the caliber of the 

 urinary tubules, we recognize that the epithelia are smaller and of a more 

 irregular form than normal. We encounter round, angular and spindle-shaped 

 bodies, with and without nuclei, which are, perhaps, newly produced epithelia, 

 detached from the walls of the tubules by a subsequent serous exudation. 

 That a reproduction of epithelia really takes place is indicated by the presence 

 of those peculiar shining bodies which adhere to the otherwise denuded wall. 



FIG. 341. CATARRHAL NEPHRITIS WITH PREVAILING INTERSTITIAL 

 INFLAMMATION. 



E, uriniferotis tubule, lined with irregular epithelia; If, cluster of desquamated epi- 

 thelia; L, shining lumps, from which new formation starts; I, considerably broadened 

 interstitial tissue, crowded with inflammatory corpuscles. Magnified 500 diameters. 



In the highest degree of catarrhal inflammation, which occurs especially 

 in the cortical substance, in the bundles of straight tubules, all the constituent 

 parts of the kidney-tissue have disappeared in the inflammatory proliferation. 

 (See Fig. 342.) The blood-vessels are no longer recognizable, and not 

 permeable for liquids injected from without. The connective tissue is strewn 

 with shining, homogeneous, irregularly shaped lumps ; the membrana propria 

 has disappeared in many places, so that no demarkation is visible between 

 connective tissue and urinary tubules. The latter, especially the narrow 

 tubules, are crowded (as a matter of course, only in places where no desqua- 

 matioii had taken place, ) with shining, many-shaped lumps, which are stained 

 a deep red by carmine. 



