Abstract
The study of the literature has shown that the morphological status of the thymus has been studied superficially in many works. The cellular composition of the thymus parts under the influence of physical or chemical environmental factors in the age aspect has not been studied enough. All this requires a more detailed study of the morphological changes occurring in this organ under the influence of various factors.
The aim of the study was to study the morphometric parameters of the cellular structures of the thymus of rats with a biostimulator ASD-2 fraction.