[The chemosensory support of feeding behavior in precocial and altricial mammals during ontogeny]. / Khemosensornoe obespechenie pishchevogo povedeniia zrelo- i nezrelorozhdaiushchikhsia mlekopitaiushchikh v protsesse ontogeneza.

The development of the structure and function of chemosensory apparatus of the tongue of mature and immature mammals was studied by scanning electron microscopy and in behavioral tests. Heterochronic development of receptors structures of dorsal surface of the tongue was established. At birth the chemoreceptors of body and root of the tongue were relatively mature in morphological aspects (the number of taste buds with pore). Taste pores in buds of anterior part of the tongue were found immediately at birth in mature and at the third week of postnatal period in immature animals. Behavioral tests found functional immaturity of chemosensory structures. Immature pups were able to recognize flavoured solutions only on the 7-10 day of age, and preference-aversion reactions of mature pups appeared to the third day of age. The data obtained are discussed in the respect of different ways of adaptation to food contacts with environment of the pups of mature and immature animals.

[Role of pain component in the organization of chemosensory taste reaction]. / Rol' bolevogo komponenta v organizatsii khemosensornoi vkusovoi reaktsii.

The investigation of algoinductor (histaminergic) and peptidergic relations in peripheral pain reaction of taste was performed by using of different histamine liberators (applied on tongue). By fluorescence-histochemical methods it was shown that histamine in the apical portion of papilla is derived from cells of taste buds and in the basal zone--from connective tissue cells (including mast cells). It was established in behavior trials on peptidergic system that consumption of taste solutions became changed. It was suggested that histaminergic structures together with SP-containing fibers ensure food controlling in oral cavity.