The objective of this study was to identify the peculiarities of lymphocyte migration in lymphoid nodules of the mucous membrane of the caecum and the trachea in autopsy material, obtained from 25 healthy individuals of various ages (from the newborns to the persons of 1st mature age). Also, the tendinous center of diaphragm was studied in 10 healthy rabbits. Using histological methods, the presence of two functionally different types of lymphatic capillaries in the wall of the caecum was demonstrated. The first group includes numerous lymphatic capillaries located around the base of the lymphoid nodules. A large number of lymphocytes in portions enter the lumen of the capillaries, in accordance with the intestinal wall contractions. The second group includes the rest of the lymphatic capillaries, draining the intestinal wall and the capillaries of the trachea, resorbing mainly the interstitial fluid. The migration of lymphocytes from the lymphoid nodules of the trachea was directed, mainly, towards the surrounding tissues. Using the lymphatic capillaries of the diaphragm as a model, it was demonstrated that during the migration of the cells through the endothelium, argyrophilic structures - the stigmata, were formed which disappeared after the passage of the cells.
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