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ULTRASTRUCTURAL CHANGES IN THE CEREBELLUM OF THE EXPERIMENTAL HYPOTHYROIDISM (CRETINISM) Motonori Deshimaru 1 , Taihei Miyakawa 1 , Megumi Kuramoto 2 1Department of Neuropsychiatry, Kumamoto niversity Medical School 2Kikuchi National Hospital for Mental and Nervous Disease pp.819-827
Published Date 1983/8/1
DOI https://doi.org/10.11477/mf.1406205174

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  • Abstract
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We examined the cerebellum of the rats being the experimental hypothyroidism (cretinism) on the 20th day, 35th day and 60th day by the light and electron microscope. The remarkable findings were observed to the experimental group on the 20 th day. The maturational states of this group correspond to that of the 16th day of the control group. On the other hand, the remarkable pathological findings were not observed on the 35 th and 60 th day of the experimental group.

According to the findings of the experimental rats on the 20 th day, the changes of the cells were the retention of the external granule cells and the maturational changes of the internal granule cells. We recognized the retardation of the matu-rational timing and a disagreement of the matu-rational rate of the internal granule cells. The lamellar bodies being the disturbance of the mito-chondrial cristae were observed. About the white matter, the myelinated nerve fibers were a small quantity in number, and the deficiency of the myelin synthesis, the maturational disturbance of oligoglia were seen. In the several axons, the lamellar bodies and the honeycomb like structures were seen.

It is concluded that the maturational disturbance of the internal granule cells are due to the distur-bance of the secondary protein synthesis by the hypothyroid state and the degeneration of the mitocondria. The deficiency of the myelin synthe-sis is related to the maturational disturbance of oligoglia.


Copyright © 1983, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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