. The diseases of poultry. DISKASKS Ol- POULTRY. 125 The larger nodules contain a greenish-yellow necrot- ic substance. The contents of the smaller nodules is more purulent, while the smallest appear simply as an area of infiltration. Microscopic examination shows that the heads of the tapeworms have penetrated the mucous membrane and ^ are situated in different layers of the intestinal wall. They are fre- quently observed be- tween the villi. The heads are not readily detected in the necrotic mass contained in the larger nodules but may almost invariably be seen in the smaller ones. In some c
. The diseases of poultry. DISKASKS Ol- POULTRY. 125 The larger nodules contain a greenish-yellow necrot- ic substance. The contents of the smaller nodules is more purulent, while the smallest appear simply as an area of infiltration. Microscopic examination shows that the heads of the tapeworms have penetrated the mucous membrane and ^ are situated in different layers of the intestinal wall. They are fre- quently observed be- tween the villi. The heads are not readily detected in the necrotic mass contained in the larger nodules but may almost invariably be seen in the smaller ones. In some cases the tape- worm can be traced through the mucous membrane to the nodule in the muscular coat in which its head appears. â. "^^â ''' "?'' .. , I i^r. 2'*.â I' A cross section of a nodule The worms attached to contiiinins-a sequestrum situated in the outer or loofritudiiial muscular layer, the mucous mem])raneare circular layer of tUe muscular wall not affected), [h] A section showinjf a tape- USUally small, but larger worm and a necrotic mass within the muscular wall. (<) A portion of a cross- believed to be of the section of the intestine showintr the head of a tarieworm witliin the muscle and one same species are found lyin^ between the vilU with its head _ resting on the basement membrane of in the intestinal con- the mucosa, magnified. tents. If the intestine is opened and the mucous sur- face carefully washed under a stream of water, the small worms are clearly observed hanging from the mucous membrane. The nodules are most numerous in the lowest third of the small intestine, but are occasionally. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Salmon, D. E. Washington, D. C. , G. E. Howard & co.
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Keywords: ., bookcentury1800, bookcollectionamer, bookdecade1890, bookyear1899
