Morphological features of the immune structures of the thin intestine of laboratory animals with various characters of nutrition

The literature has data on the study of the immune structures of the small intestine under normal conditions and under the influence of certain factors. In the structure of immune structures there are numerous parallelisms; however, in each class of vertebrates, complication of this organization is achieved independently. In a very rare case, we found single lymphocytes and in the lumen of the crypts, near their epithelium. Single lymph nodes are located mainly in their own plate of the mucous membrane. This part of the mucous membrane protrudes into the intestinal lumen. Such accumulations in the wall of the jejunum are extremely rare. They consist of closely spaced nodules, between which there is a small distance dotted with lymphocytes.