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      Ultrastructural features of Glisson's capsule and the overlying mesothelium in rat, monkey and pike liver.

      Tissue & cell
      Animals, Basement Membrane, physiology, ultrastructure, Collagen Type I, Connective Tissue, Desmosomes, Epithelial Cells, Epithelium, Esocidae, Fibroblasts, Hepatocytes, Liver, Macaca mulatta, Male, Microscopy, Electron, Transmission, Microvilli, Pinocytosis, Rats, Rats, Sprague-Dawley, Species Specificity

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          Abstract

          Samples from the liver of a male rat (Sprague-Dawley), a monkey (Macacus rhesus), and a longnose gar pike (Lepisosteus osseus) were studied in a transmission electron microscope to provide cytological and histological information about structures previously poorly documented in the literature. Glisson's capsule consisted of dense, irregular connective tissue of typical Type-I collagen fibrils. The capsule was formed by a single stratum of fibroblasts in the rat and in the pike, but by one or two strata of fibroblasts in the monkey. In the rat, but not in the monkey or pike, fibroblast processes interdigitated with processes from the hepatocytes. In the pike, fibroblast processes extended toward both mesothelium and hepatocytes. In some areas of the rat and pike, mesothelial cells had desmosomal connections and microvillous projections into the peritoneal cavity. Marginated heterochromatin was more abundant in the rat and monkey. The mesothelium was discontinuous in the rat and monkey but, in areas of discontinuity, the capsular surface was covered by a basal lamina, often barely perceptible beneath mesothelial cells of the rat and monkey, but prominent in the pike. In the pike, the mesothelium had numerous pinocytotic vesicles on both peritoneal and capsular surfaces.

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