犬の汗腺の構造と機能に関する研究

Abstract

It has long been considered by many physiologists that sweat gland of the dog was not functional. Nevertheless, many sweat glands are found in all parts of hairy skin in the dog. In this paper, we have attempted to investigate the significance of these glands on the point of functional cytology as well as of microspectrophotometry. The results obtained are as follows:1) Apocrine sweat glands of dog are obviously functional. But, it is supposed that sweating of these glands is not physiologically important because population of the gland is very small as compared with hair population and secretory tubule of the gland is poorly developed.2) Epithelial cells of apocrine sweat gland contain a large amount of lipids and neutral mucopolysaccharides or mucoproteins. They are decreased or increased by its functional phase.3) Eccrine sweat glands of dog are found in skin of foot pads. Epithelial cells of these glands are divided clearly into two types, clear and dark cells, as is seen in human eccrine sweat glands. The former contains a large amount of glycogen and the latter a much of Schiff positive diastase resistant materials.4) Physiological significance of the eccrine sweat gland in dog differs from that of man's. It has been supposed that role of the gland in dog has been differentiated to mechanical defense from the circumstances by its secretory fluid rather than the regulation of body temperature.