[Localization of choline acetyltransferase in the alveolar portion of the mammary gland of the white mouse].

The light optic investigation has been performed on the 10th--15th days of lactation. The enzymatic activity has been determined by Burt method (1971). The product of histochemical reaction is revealed in the secretory cell and in the basal parts of the alveoli, that corresponds to location of myoepithelial cells. Localization of the reaction product in the secretory cells of the neighbouring alveoli is heterogeneous. The enzyme of acetylcholine synthesis is revealed along the course of single neural fibers included into the composition of the ileo-hypogastric nerve of the mammary gland. The results obtained, together with the data of certain physiological investigations make it possible to substantiate participation of the cholinergic mechanism in the alveolar cells activity and consider participation of the cholinergic process in intercellular interactions, that ensure functional conjugation of myoepithelial and secretory cells.