3IO 



ACTINOMYCOSIS 



subject in which the left jugular vein was perforated by a mass 

 of the fungi resulting in the formation of actinomycotic infarcts 

 in the lungs, spleen, brain, and heart. 



In cattle, actinomycosis usually appears in one or more of 

 the following locations. 



1. In the maxillary bones. Here it generally results in 

 large tumor-like growths. Actinomycosis of the jaw usually 

 commences with fiat granulation of the gums and mucous 

 membranes in the neighborhood of the teeth and spreads 

 finally to the medullary tissues of the bone and to the perios- 

 teum, soon giving rise to the osseous tumor. From the maxil- 

 lary bone the disease may advance either to the subcutaneous 

 connective tissue and the skin or to the oral cavity in the 

 direction of the molar teeth, which become displaced. 



2. In the tongue. When the lesions appear in this organ 

 the disease takes the form of an indurating glossitis. The 

 tongue becomes thickly sprinkled with round or oval, hard. 



Fig. 77. Actinomycosis of the tongue, "wooden tongue" {Photographed 



by Hopkins). 



fibrous nodules which finally become purulent or chalky at the 

 center. Around these there is a considerable increase of con- 

 nective tissue which leads to the atrophy of the muscle fibers. 



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