Ultrastructural organization of the hamster renal pelvis.

摘要: The renal pelvis of the hamster has been studied by light microscopy (epoxy resin sections), transmission electron microscopy, and morphometric analysis micrographs. Three morphologically distinct epithelia line pelvis, each covers a different zone kidney. A thin epithelium covering outer medulla (OM) consists two cell types: (1) granular cells are most numerous have apically positioned granules which stain intensely with toluidine blue, membrane-bound, contain fine particulate matter that stains grey to black in (2) Basal do not granules, confined basal lamina region, reach mucosal epithelial surface. inner (IM) is covered pelvic similar collecting duct IM. Some this portion dark osmium tetroxide, lead, uranyl acetate. Transitional epithelium, separates cortex (C) from urine, an asymmetric luminal plasma membrane discoid vesicles, those previously observed mammalian ureter urinary bladder epithelia. Based on morphological comparisons other epithelia, IM OM would appear permeable solutes and/or water, while transitional C appears relatively impermeable. It also exchange water between urine involve capillaries, primarily, since showed both fenestrated continuous capillaries were extremely abundant (greater than 60% surface area) just under epithelium.