MORBID ANATOMY 211 



tissue. The process usuall5' differs widel}' from that of a 

 simple inflammation. In its progress the disease shows no 

 preference for structures but invades one tissue after another 

 so that all may be involved alike. 



The lymphatics show no constant tendencj' to become 

 involved. Metastasis occurs in a very small proportion of the 

 ■cases. When it does, as reported by Ponfick, large areas may 

 be simultaneously affected. He reports a case in the human 

 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, viz.: (i) in the maxillarj' bones it 

 generalh' results in large tumors. Actinomycosis of the 

 jaw usually commences with flat granulations of the 

 gums and mucous membranes in the neighborhood of the 







Fig. 46. Photograph of a section through an actinomycotic Jaw. 

 ((7 1 tooth, (&} bone, {c) actinomycotic tissue. 



teeth and spreads finally to the medullary tissues of the bone 

 and to the periosteum soon giving ri.se to the osseous tumor. 

 From the maxillary bone the disease may advance either to 



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