[Correlation of neuronal parameters of cingulate lamina V and lamina III pyramidal neurons in the rat]

Abstract

The data obtained by quantitative neuromorphological investigations of pyramidal cells from the cingulate cortex of 3 month old rats gave evidence for significant statistical correlation between different parameters of lamina III- as well as lamina V-pyramids. The spine-number counted in single apical dendritic fields (EDF) was highly positive correlated to the total apical spine-sum and the some correlation existed in the basal dendritic tree; i.e. the data obtained in a basal EDF were representative for the whole basal dendritic tree, respectively. In the fully developed pyramids the parameters of the apical dendritic tree were considered to be of stronger importance for the data collected from the whole dendritic tree of the neuron. However, in more primitive pyramids the parameters of the apical and basal dendritic tree were found to be of the same significance for the data of the whole neuron. The development of the apical dendritic tree when compared with the basal one gave never positive correlations in their sum parameters. Significant correlation was obtained between the length of the dendrites and the volumes of their distribution area. In fully developed regular pyramids the statistical analysis gave evidence for a higher importance of distal parts of the dendritic tree as representative for the sum parameters, in contrast to primitive pyramids with higher significance of the perikaryon-near parts. These primitive pyramids are quite abundant in the phylogenetically older mesoarchicortical and mesoneocortical parts of the cingular cortex.