Variant of periodization of biologicallysimilar stages of human and rat's ontogenesis

The research was carried outgrowing individuals of white laboratory outbred rats. Proportional age ratio of investigated objects and age periods of human was made. Carrying out morphological research on animals with subsequent transferring these data on human purposely to realize the analysis of features of body systems' formation during prenatal and postnatal periods of ontogenesis is obviously possible.