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ON THE SOMATOTOPICAL LOCALIZATION OF THE FIBERS IN THE PYRAMIDAL TRACT:Observations on the Monkeys Noboru Mizuno 1 , Michio Okamoto 1 1The 1st Division, Dept. of Anatomy, Faculty of Medicine, Kyoto Univ. pp.557-564
Published Date 1963/6/1
DOI https://doi.org/10.11477/mf.1406201484

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  • Abstract
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It has deen currently believed that the fibers are arranged somatotopically in the pyramidal tract and the diagrams illustrating such a somatotopical localization are found in current books of Neuroanatomy and clinical Neuro-logy. The diagnosis concerning the site of tumor or hemorrhage in the brain has usually been made according to the idea obtained from these diagrams.

It is, howerer, rather astonishing to find no previous data available to prove such a somatotopical localization of fibers in the pyramidal tracts in man as well as in other animals.

In this present investigation lesions were made in the medullary pyramid of monkeys. and the changes in behaviour of animals were observed after the operation. The degenerat-ed fiber tracts of spinal cords were traced by means of Marchi method.

As the results there was no finding indicates the existence of any somatotopical localiztion in the arrangement of fibers composing the pyramidal tract in the medullary pyramid as well as in the spinal cord. Authors want to call special attention to the discrepancy bet-ween the current idea and the fact.


Copyright © 1963, 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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