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An autoradiographic study of the organization of intrahippocampal association pathways in the rat

An autoradiographic study of the organization of intrahippocampal association pathways in the rat The longer associational connections of the hippocampal formation have been studied autoradiographically in a series of adult rats after small injections of 3H‐amino acids into each of its various cytoarchitectonic fields. The major findings can be summarized as follows. The dentate gyrus projects in a topographically ordered manner upon the pyramidal cells of the regio inferior by way of the supra‐ and infrapyramidal bundles of mossy fibers. Certain cells in the hilar region of the dentate gyrus (which operationally may be defined as constituting field CA4 of Ammon's horn) give rise to a hippocampodentate projection to the inner one‐quarter of the molecular layer of the dentate gyrus. Either the same or closely related cells give rise to fibers which join the Schaffer collateral system from field CA3 to the stratum radiatum and stratum oriens of the regio superior. The regio inferior is also characterized by a longitudinally directed associational bundle which runs throughout the septo‐temporal extent of the hippocampus and is centered in the region of subfield CA3a. The regio superior has no reciprocal projection to the regio inferior but sends a substantial projection back to the subiculum and to the entorhinal area. There is also a projection to the subiculum from the regio inferior, and the subiculum itself probably contributes significantly to the projection to the entorhinal and perirhinal cortices. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Comparative Neurology Wiley

An autoradiographic study of the organization of intrahippocampal association pathways in the rat

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References (39)

Publisher
Wiley
Copyright
"Copyright © 1978 Wiley Subscription Services, Inc., A Wiley Company"
ISSN
0021-9967
eISSN
1096-9861
DOI
10.1002/cne.901810402
pmid
690280
Publisher site
See Article on Publisher Site

Abstract

The longer associational connections of the hippocampal formation have been studied autoradiographically in a series of adult rats after small injections of 3H‐amino acids into each of its various cytoarchitectonic fields. The major findings can be summarized as follows. The dentate gyrus projects in a topographically ordered manner upon the pyramidal cells of the regio inferior by way of the supra‐ and infrapyramidal bundles of mossy fibers. Certain cells in the hilar region of the dentate gyrus (which operationally may be defined as constituting field CA4 of Ammon's horn) give rise to a hippocampodentate projection to the inner one‐quarter of the molecular layer of the dentate gyrus. Either the same or closely related cells give rise to fibers which join the Schaffer collateral system from field CA3 to the stratum radiatum and stratum oriens of the regio superior. The regio inferior is also characterized by a longitudinally directed associational bundle which runs throughout the septo‐temporal extent of the hippocampus and is centered in the region of subfield CA3a. The regio superior has no reciprocal projection to the regio inferior but sends a substantial projection back to the subiculum and to the entorhinal area. There is also a projection to the subiculum from the regio inferior, and the subiculum itself probably contributes significantly to the projection to the entorhinal and perirhinal cortices.

Journal

The Journal of Comparative Neurology – Wiley

Published: Mar 15, 1979

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