STRUCTURAL CHANGES DUE TO DAMAGE. 331 



of the embolus, whether it contain pathogenic bacteria or not. In 

 the former case the embolus is called a septic, in the latter a bland, 

 embolus. 



In septic embolism an acute inflammation, similar to that at the 



FIG. 292 



*p;v 



< - * : L 



- *>*<$ 

 $>' % 



>:^v. , 



Metastatic abscess in the heart, due to septic embolism. (Birch-Hirschfeld.) The abscess- 

 cavity contains red blood-corpuscles and leucocytes with fragmented nuclei. The 

 muscle-fibres within and near the cavity have been killed and many of them dissolved. 



site of the original lesion, is induced by the bacteria brought with 

 the embolus. If the original inflammation was suppurative, ab- 



Experimental ansemic infarction of the kidney ; rabbit. (Foa.) a, necrotic tissue formerly 

 supplied by the artery obstructed ; b, zone of affected tissue surrounding the infarct. In 

 this zone the renal tubules contain hyaline casts, and their lining epithelium shows an 

 evanescent tendency to proliferate, some of the cells containing karyokinetic figures, c, 

 normal renal tissue. 



scesses, callecf metastatic abscesses, are formed around each septic 

 embolus (Fig. 292). 



In bland embolism, when there are ample anastomoses between 

 the vessel plugged and other vessels beyond the site of the embolus, 



