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On a Poorly Medullated Bundle (Tractus centrogriseo-nigralis) in the Midbrain of the Carnivores Toshiko Sekino 1 1Brain Research Institute, Medical School, Univ. of Tokyo pp.385-394
Published Date 1958/6/1
DOI https://doi.org/10.11477/mf.1406200676
  • Abstract
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The author studied the tractus centrogriseo-nigralis (named so by Tsuru 1939 in the mo-le and the rabbit) in eight kinds of the car-nivores upon serial sections stained by Pal-carmin method.

The bundle in question is found in the mid-brain of all the animals examined, and is characterized by very weak myelinisation and by remarkable stainability to carmine. It pa-sses always through the lateral region of the medial lemniscus approximately at the level of the caudal end of the magnocellular red nucleus. In all of the animals studied except Canis familiaris and Nyctereutes procyonoides this group of fibers is divided into two bran-ches, one going dorsomedially and another bending caudally. A part of the former is traceable to the central gray substance at the level of the trochlear nucleus in Felis dome-tica, Canis familiaris, and Mustela melampus, though most of the fibres become undisting-uishable on the way, as Tsuru mentioned the same situation in the rabbit. The latter branch goes downwards and disappears in the reticular formation at the level of the caudal colliculus.


Copyright © 1958, 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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