410 



ACTINOMYCOSIS 



Morphology of the Actinomyces Granule. The last two methods 

 given stain the filaments blue and the pear-shaped clubs yellow or 

 pink. In sections stained by these methods the details of the structure 

 of the rosette can be studied. The actinomyces granule in tissue or 

 pus is found to be a more or less spherical or oval body which includes 

 in its interior an only partially filled cavity. The wall of the cavity 

 is composed of densely crowded, richly branched filaments, which on 



FIG. 163 



Actinomycosis of a fibrous cord of ahorse. X 400. (Author's preparation.) 



the whole have a radial direction. The interior of the cavity also con- 

 tains branched filaments, but in comparison with the dense wall 

 only in moderate numbers. Many of the filaments are quite slender 

 and uniformly stained. They are provided with a delicate membrane. 

 These filaments are not straight, but wavy; spirillum and spirocheta- 

 shaped filaments are also present. The primary branches divide 

 dichotomously. Lines of partition are seen in the filaments; they 

 divide them into shorter segments, bacilla-like portions, and even 



