This work analyzes the controversial problems of lymphology, which require the scientific substantiation. Authors express their opinion on the functional anatomy of the lymphatic system, based on their own research and the literature data. The issues of lymphatic drainage from the spleen, bones, muscles, ligaments and fascia are discussed. The data on the diameter of the lymphatic vessels and its variability are presented. The significant attention is given to the changes of the lymphatic system structures during dehydration and rehydration. The role of lymphatic capillaries in the inflammatory processes is emphasized. The contradictions in the description of lymphatic postcapillaries are noted.