File:Diseases of cattle, sheep, goats and swine (1920) (20780055189).jpg

Title: Diseases of cattle, sheep, goats and swine
Identifier: diseasesofcattle00mous (find matches)
Year: 1920 (1920s)
Authors: Moussu, Gustave, 1864-; Dollar, Jno. A. W. (John A. W. )
Subjects: Veterinary medicine
Publisher: Chicago : American Veterinary Pub. Co.
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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TUBERCULOSIS. 689 Even when the hings are unaffected it may happen that the lym- phatic glands of the mediastinum (superior or inferior oesophageal lymphatic glands) and the hronchial lymphatic glands may be so diseased that the oesophagus is completely surrounded and compressed by them, and its function thus seriously impaired (Fig. 276). In the abdomen the mesenteric glands are most exposed to disease, and when infected through the intestinal tract they assume the form of large flattened masses arranged along the mesentery. In the digestive tract, as in the trachea and bronchi, tuberculosis has a marked tendency to assume the ulcerative form. Disseminated or aggregated tubercles develop in the thickness of the mucous mem- brane, and, after rapidly softening, become ulcerated. The nature of
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Fig. 276.—Tuberculosis of lymphatics. PG, Left lung ; PD, right lung ; TT, tuberculous oesophageal lymph glands; A, aorta; ffi, oesophagus (the lung is divided transversely near its centre). these lesions can only be determined by noting their character and examining the discharge. The ulcerations are localised in the mouth and pharynx, in the second half of the small intestine towards the ileum, and in Peyer's patches. Tuberculous lesions develop in the vaginal sheath of the male genital organs exactly in the same way as in an ordinary closed serous cavity; tubercles may also develop on the surface or in the substance of the testicle. They become aggregated, undergo softening, spread towards the interior, and may break down, thus forming abscesses. In the female genital passages the disease invades the thickness of the walls, but shows a marked tendency to ulceration, as in the intestine or trachea. In the udder tuberculosis is generally diffuse, shows a tendency to hypertrophy and the free formation of fibrous or sclerous tissue; only tubercles in the glandular layer of the acini become ulcerated. In time the whole of the secreting structure undergoes diffuse tuber- culous suppuration, fibro-caseous masses form in the depths of the tissue and may soften, producing deep-seated tuberculous " cold abscesses." D.c. Y y

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