[Microscopic organization of epithelial endocrine cells of the gastrointestinal tract mucosa in lower vertebrates. I. Epithelial endocrine cells of the stomach of the common frog].

The quantity, histotopography and submicroscopic organization of endocrine cells in various mucosal epithelium sections of frog were studied using light and electron microscopy. It is shown that the majority of endocrine cells per square millimetre is located in the proximal part of the stomach. Eight types of endocrine cells depending on the submicroscopic structure of secretory granules are defined.