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The longitudinal zonal pattern in the paramedian lobule of the cats cerebellum an analysis based on a correlation of recent horseradish peroxidase data with results of studies with other methods


Journal of Comparative Neurology 187(3): 581-588
The longitudinal zonal pattern in the paramedian lobule of the cats cerebellum an analysis based on a correlation of recent horseradish peroxidase data with results of studies with other methods
In a previous study of the distribution of retrogradely labeled cells in the inferior olive of the cat after microinjections of horseradish peroxidase (HRP) in the contralateral paramedian lobule (Brodal and Walberg, 1977b), 3 longitudinal zones were distinguished. The zones were assumed to correspond to Voogd's zones C1, C2 and D, receiving their afferents from parts of the dorsal accessory olive, of the medial accessory olive and of the dorsal lamella of the principal olive, respectively. Labeled cells were not found in the ventral lamella of the principal olive, however, although there is no doubt that this also projects to the paramedian lobule. In this study, iontophoretic ejections, covering the extreme lateral part of the paramedian lobule, gave rise to labeling of cells in the ventral lamella. The zone D in the paramedian lobule can be subdivided into 2, a lateral, D2, and a medial, D1, receiving fibers from the ventral and dorsal lamella, respectively. Neither zone extends throughout the entire length of the paramedian lobule. Both are lacking most rostrally and most caudally. This and other findings prompted a renewed analysis of the entire pattern of zonal representation in the paramedian lobule, based on correlations of observations with the HRP method with data obtained with other methods. The results of this analysis are briefly described and summarized in a diagram. Zone B is present in some folia medially. A somatotopical arrangement appears to be present within all zones.


Accession: 006712122



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