HISTOLOGY AND CYTOCHEMISTRY OF HUMAN SKIN .4. THE ECCRINE SWEAT GLANDS

[摘要] Two moderately distinct types of cells line the secretory tubules of eccrine glands; on the basis of their affinity for basic dyes they are designated as dark and clear cells. The smaller, dark cells contain numerous granules which are chiefly composed of ribonucleic acid; in the terminal cytoplasm these granules are very coarse. The larger, clear cells possess only sparse, very fine granules. Vacuoles and inter- and intracellular canaliculi are conspicuous only in the clear cells. Both dark and clear cells contain abundant glycogen and numerous mitochondria. The secretory cells have in their eytoplasm lipid granules, most of them pigmented, which are reactive to Baker''s test for phospholipids. Both lipid and pigment resist extraction in lipid solvents and are sudanophilic even after embedding in paraffin. The cells of the lower portion of the excretory duct abound in ribonucleic acid, glycogen and mitochondria. These facts strongly suggest that duct may have an active secretory or reabsorbing function.