Histochemical features of the formation of the protective barrier of the stomach in various periods of ontogenesis of mammals

: By means of a complex of histochemical methods it has been demonstrated that cytochemical differentiation of the tegmental epitheliocytes and secretory cells of the fundal glands takes place in different time. In Carnivores the tegmental epitheliocytes complete their cytochemical differentiation during the prenatal period, mucocytes--to the time of birth, and chief exocrinocytes--to the period of mixed feeding. In phytophagous animals formation of the protective barrier in the stomach occurs differently: in the mouse and hamster the cytochemical differentiation of the tegmental and glandular epitheliocytes is completed during the prenatal period, and in the rabbit and guinea pig--only by the 30th day after birth.