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Organization of cingulo-ponto-cerebellar connections in the cat

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Summary

This study deals with three different aspects of the organization of connections from the cingulate gyrus to the cerebellum. (1) With the use of wheat germ agglutinin-horseradish peroxidase as a retrograde tracer, the distribution of cingulate neurons projecting to the pontine nuclei was studied. Retrogradely labeled cells were found in layer 5 in all parts of the cingulate gyrus. Average densities of cingulopontine cells were similar in the different cytoarchitectonic subdivisions, although some density gradients were observed. The projection was found to be remarkably strong. Average densities of corticopontine cells in the cingulate gyrus ranged from 500–700 cells per mm2 cortical surface, and the total number of neurons was in the range of 75000–105000 (n=4). (2) A topographical organization of terminal fields of fibers originating in different parts of the cingulate gyrus was demonstrated with the combined use of anterograde degeneration and anterograde transport of wheat germ agglutinin-horseradish peroxidase. Terminal fibers originating in different zones of the cingulate gyrus were distributed in a patchy mosaic within a narrow band along the ventromedial aspect of the pontine nuclei. (3) We confirm, with the combined use of lesions in the cingulate gyrus and injections of wheat germ agglutinin-horseradish peroxidase in the ventral paraflocculus, that there is considerable overlap between terminal fibers originating in the cingulate gyrus, and cells retrogradely labeled from the ventral paraflocculus. The role of the ventral paraflocculus as a receiver of “limbic” input is discussed.

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Authors and Affiliations

  1. Department of Anatomy, Institute of Basic Medical Sciences, University of Oslo, Blindern, P.O. Box 1105, N-0317, Oslo 3, Norway

    Per Brodal, Jan G. Bjaalie & Jan-Erik Aas

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  1. Per Brodal
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  2. Jan G. Bjaalie
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  3. Jan-Erik Aas
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This paper is dedicated to Professor Fred Walberg on the occasion of his 70th birthday

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Brodal, P., Bjaalie, J.G. & Aas, JE. Organization of cingulo-ponto-cerebellar connections in the cat. Anat Embryol 184, 245–254 (1991). https://doi.org/10.1007/BF01673259

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