PYRAMIDAL TRACT RESPONSE TO CORTICAL STIMULATION IN THE RAT

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  • OHTA Masahiro
    Department of Physiology, Faculty of Medicine, Kyushu University
  • TASHIRO Nobuo
    Department of Physiology, Faculty of Medicine, Kyushu University

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1. The pyramidal tract response to cortical stimulation was examined in twenty adult rats and was compared with the antidromic cortical response and with the histological sections of the cerebral cortex made by Bodian's method.<BR>2. The pyramidal tract response consisted generally of two positive potentials, D and I waves.The D wave is caused by the direct excitation of the cortical pyramidal tract neurons and the I wave by the indirect or synaptic excitation of the same neurons.Sometimes there are a few I waves and sometimes there is no I wave.<BR>3. The D wave has lower threshold for cortical stimulation and is less facilitated by repetitive stimuli than the I waves.<BR>4. The cortical representation of the pyramidal tract response corresponds fairly well with the cortical motor area but is slightly different from the distribution of the antidromic cortical response.<BR>5. This is well explained by histological observation of the cortical pyramidal cells and the functional significance of the apical dendrites of these cells is emphasized.

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