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The openings of the central canal in the filum terminale internum of some mammals

, : The openings of the central canal in the filum terminale internum of some mammals. Journal of Neurocytology 5(5): 531-544

Openings of the central canal in the filum terminale internum of the rabbit, guinea pig and rat were studied by light microscopy and EM. There were 2 openings in the rabbit, 2 or 3 in the guinea pig and 1 in the rat. They opened dorsally and were of 2 types; 1 type was without a pial covering, the other with a pial covering. In both types, a focal junctional apparatus associated with increased density of the subjacent cytoplasm was observed between the pial cell and the ependymal cell at the margins of the opening, where the basal lamina on the surface of the filum terminale showed a characteristic ending for each species. Injections of india ink into the lateral ventricle of the brain indicated that the CSF of the ventricular system drains out of the central canal by way of these openings, into the subarachnoid space. Reissner's fiber of the rabbit and rat consisted of a mass of moderately electron dense fibrous material containing many small vesicles in the central canal of the filum terminale. This mass passed through the openings into the subarachnoid space and continued into the subdural space.

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Accession: 006728396

PMID: 978229

DOI: 10.1007/bf01175567

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