[Endocrine cells in the large intestine epithelium in various vertebrate species].

Amount of argyrophile and argentoffin endocrine cells per 1 mm2 of the large intestine mucous membrane has been counted in the turtle, pigeon, white rat and frog at various periods of their life (winter hibernation, awakening, active life). As the animal's organization becomes more complicated, the amount of the endocrine cells in the epithelium increases both in the initial and in the terminal parts of the large intestine, their amount in the terminal (rectum) part being less than in the initial one. The greatest amount of the endocrine cells is found in simmer frogs at the expense of increasing content of the elements that do not belong to the argentaffin group. The latter do not significantly change during various seasons.