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ELECTRON MICROSCOPY OF THE DUCT, AND ESPECIALLY THE "CUTICULAR BORDER" OF THE ECCRINE SWEAT GLANDS IN MACACA MULATTA

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238.tif ELECTRON MICROSCOPY OF THE DUCT, AND ESPECIALLY THE "CUT ICULAR BORDER" OF THE ECCRINE SWEAT GLANDS IN MA CA CA MULA T TA RICHARD A. ELLIS and WILI.IAM MONTAGNA. FronI Arnold Biological Laboratory, Brown University, Providence Previous electron microscopic studies on the coiled duct of the eccrine sweat glands have described the luminal cells as having "a cuticle of fibrous texture" (1) or "osmiophilic bands" (2). These terms were apparently used to describe a struc- ture which we have now resolved to be a highly developed terminal web associated with an elaborate system of desmosomes. OBSERVATIONS The coiled duct of the eccrine sweat glands con- sists of two or three layers of epithelial cells con- centrically arranged around the lumen (Fig. 1). The superficial cells have a fibrous luminal border; the peripheral cells, usually contain moderate amounts of glycogen and rest on a poorly de- veloped basement membrane. Numerous blood vessels and unmyelinated nerves adhere to the coiled duct. The Luminal Border: The low microvilli on the inner surface of the luminal cells are surrounded by a plasma membrane composed of two adielec- tronic lines separated by a light band. The outer dense line is ~50 A thick, the thinner one ~20 A; the light band between them is about 25 A wide. A few smooth surfaced vesicles in the cyto- plasm beneath the microvilli may result from FIGURE 1 A low power electron micrograph through the eoilcd eccrine sweat duct of the rhesus monkey. A small portion of the lumen (L) of the gland is visible. Low microvilli sur- mount the luminal border (B), where several large dense desmosomes (D) are visible joining the plasma membranes of two adjacent luminal cells. Numerous small mito- chondria (M), agranular and granular membranes appear in the cytoplasm of the superficial and the peripheral cells. Organized Golgi elements and ergastoplasm have not been observed in the duct cells. The opposed plasma membrane

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