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DISTRIBUTION OF ASSOCIATION FIBERS IMPINGING UPON THE MIDDLE SUPRASYLVIAN SULCUS AREA (MSs AREA) IN THE CAT Jumpei Naito 1 1Department of Anatomy I, School of Medicine, Iwate Medical University pp.37-46
Published Date 1978/1/1
DOI https://doi.org/10.11477/mf.1406204182

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  • Abstract
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Following lesions of various cortical areas of altogether 13 adult cats, the distribution of de-generating fibers in the cortical area surrounding the middle suprasylvian sulcus (MSs area) has been studied with the method of Fink and Heimer. Associ-ation fibers from the visual cortex mostly end in the vicinity of fundus of the medial wall of the MSs area and a fair number of fibers do in the fundus area of the posterior portion of its lateral wall. Most of the fibers terminate in layers III-V. Fibers from the auditory cortex terminate in the lip of the lateral wall, while few fibers end in the fundus and the medial wall. The fibers termi-nate in layer III. Long association fibers from the somatosensory cortex chiefly end in the vicinity of the fundus of the anterior half of the both walls. The fibers terminate in layers III-V. The associ-ation cortex" sends a good amount of fibers to the lip region and the upper area of the medial wall and lesser amount to the posterior part of the lateral wall of the MSs. The fibers terminate in layer III.

From the present and the previous findings, it has become evident that inputs of different kinds of sensory modalities converge upon the layers III-IV of the MSs area from the various cortical functional areas, and that the MSs area also sends fibers back to the sensory cortical areas. In ad-dition, it has reciprocal connections with some thalamic nuclear groups, e. g., the "pulvinar pos-terior " system.

Based upon the findings of neuronal connections, it can be suggested that the MSs area may play an important role with regard to the "integration of sensory inputs" in the cat cerebral cortex.


Copyright © 1978, 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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