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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 54 (1981), S. 143-147 
    ISSN: 1432-0533
    Keywords: Hydrocephalus ; Ependyma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Obstructive hydrocephalus was produced in 14-day old rabbits by injection of kaolin into the cisterna magna. The ependymal lining was studied by scanning electron microscopy. Marked hydrocephalus was present 1 or 2 weeks after the kaolin injection. The ependymal lining adapted remarkably well to the rapid expansion by increasing the surface area of the ependymal cells. No breaks or denudement of the ependymal lining was observed except at the sites of ruptured ventricular synechiae. Generally, these findings confirm previous light and electron microscopic observations on the same model (Torvik et al. 1976; Torvik and Stenwig 1977). The results are discussed in relation to current theories concerning the pathophysiology of acute hydrocephalus.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 38 (1977), S. 21-26 
    ISSN: 1432-0533
    Keywords: Hydrocephalus ; Ependyma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Obstructive hydrocephalus was produced in 10–14 day-old rabbits by injection of kaolin into the cisterna magna and the ependyma and subependymal tissue was studied by electron microscopy. Generally, the study confirmed recent light microscopic observations on similar models (Torvik et al., 1976). In contrast to most previous reports,it was found that the ependyma adapted remarkably well to ventricular dilatation. No true ependymal defects occurred even in extensive hydrocephalus except at the sites of the ventricular synechiae which sometimes ruptured. The specialized ependymal junctions remained intact but outside the junctions the intercellular clefts were widened, particularly along the lateral wall of the lateral ventricle. The density of the microvilli and cilia decreased, probably because of the increase in the surface area of the ependyma. Dense bundles of filaments developed in the ependymal cells of the hydrocephalic animals. The extracellular space of the subependymal white matter appeared increased but there was no evidence of destruction of fibres or cells. Thus, the reduction of the cerebral mantle thickness was probably mainly caused by pressure atrophy.
    Type of Medium: Electronic Resource
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