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Intracortical connections between neuron groups in the somatosensory cortex studied by the retrograde horseradish peroxidase transport method in rats

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Abstract

Short corticocortical connections between specialized groups of neurons (so-called barrels) were studied in the somatosensory cortex. After microinjections of horseradish peroxidase into a definite "barrel" labeled neurons were found in nearby groups within a radius of up to 400 µ. Labeled neurons were located chiefly in cortical layers V and III; 90% of them were pyramidal cells. Intracortical connection of labeled neurons were 1.6 times more numerous than thalamocortical connections. It is postulated that connections between neighboring cortical neuron groups are effected through their output cells, i.e., through pyramidal neurons of layers V and III.

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Research Institute of Neurocybernetics, Rostov State University. Translated from Neirofiziologiya, Vol. 15, No. 1, pp. 22–26, January–February, 1983.

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Lapenko, T.K., Podladchikova, O.N. Intracortical connections between neuron groups in the somatosensory cortex studied by the retrograde horseradish peroxidase transport method in rats. Neurophysiology 15, 16–20 (1983). https://doi.org/10.1007/BF01059924

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