The aim is to study the histological features of the small intestine in white rats with experimental pulmonary fibrosis. Materials and methods of research.To solve the tasks, 131 laboratory white male rats, weighing 120-150 grams,served in vivarium conditions. All the animals were divided into two groups. In the first group there were 36 intactrats. The second group consisted of 95 mature males, the effect of experimental lung fibrosis on the tissue structures of the small intestine was studied. For general morphological studies, pieces of tissue from 3 sections (duodenum, jejunum and ileum) of the small intestine were fixed in a neutral 10% solution of formalin, Carnois fluid. After the appropriate wiring, the material was poured into paraffin. Further, sections 4-6 microns thick with the strictest orientation after dewaxing were stained with hematoxylin-eosin for morphological and morphometric studies.

experimental fibrosis, small intestine, lymphoid follicles.