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Tri nitro phenol lesions of the ventricular wall a scanning electron microscope and transmission electron microscope study


Scanning Electron Microscopy (3): 449-456
Tri nitro phenol lesions of the ventricular wall a scanning electron microscope and transmission electron microscope study
These experiments were performed to study the ventricular walls of the brain following more or less extensive lesioning of the ependyma and during the process of repair. Trinitrophenol (TNP, 1% in saline) was injected into the ventricular system of adult rats of both sexes. The animals were fixed for scanning electron microscopy [SEM] and transmission electron microscopy 26 h or 5, 7, 11, 21, 30 and 40 days post-injection. TNP caused areas of irreversible lesions in ependymal cells, but the surrounding unlesioned cells showed no signs of a regenerative reaction. The number of supraependymal cells increased considerably at the sites of lesion, their shapes being markedly different from those of comparable cells in control animals. The subependymal tissue presented spongiosis. After a phase in which the lesioned ventricular surface was covered with abundant cell debris, the subependymal astroglia proliferated, producing an extensive layer of cell processes which substituted for the missing ependymal cells. The formation and morphological characteristics, particularly as visualized with the SEM, of an experimentally induced gliosis in the ventricular wall of adult rats were examined.


Accession: 006840232



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