TUBERCULOSIS 



intestinal mucosa, 

 primary tubercular 

 ulcers may develop 

 or they maj' pass 

 into the mesenteric 

 Ij-mphatics or the 

 portal vein. It may 

 happen that the 

 bacteria may be car- 

 ried by means of 

 the lymph or blood 

 stream and lodge in 

 anj' part of the 

 body, such as the 

 brain, kidneys, 

 spleen, testes, ovar- 

 ies, bones, joints, 

 and subcutaneous 

 and intermuscular 

 glands and serous 

 membranes. The 



Fig. 25. Dorsal aspectofboinne lungs. a-a\^"'''^'^^^^^ ^^ hand, 



right and left caudal lobes. b-b\ r. and I. ven- however, seems to 



tral lobes, c-c^, first and second right (;r/>/;a/?V show that in a large 



lobes, f-', left cephalic lobe, c, trachea, x .r, nj^ioritv of cases 



ration most frequently involved in the earliest ^, . , • 



r ^ , , , , . „, , . the prnnary lesions 



stages of pulmonary tuberculosis. 1 he lesion^ 



are usually at this stage embedded in the lung are ( I ) m the lungs 

 tissue. {Smith.) or the lymphatic 



glands draining them, (2) in the lymphatic glands about the 

 head, (3) the intestines and mesenteric glands, and (4) in the 

 portal glands or liver substance itself. Primary lesions some- 

 times occur in the generative organs and udder. 



It not infrequently happens that the apparent primary 

 lesions occur on the pleura, peritoneum, meninges or synovial 

 membranes while the organs remain free from disease. In such 

 cases the lesions consist of many tubercles varjdng from 

 one to ten or more millimeters in diameter or of bunches of 

 closely set tubercles which are more or less flattened or irregular 



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