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AN A. L. TOWE Department of Physiology (Received Biophysics, University of Washgton School of Medice, Smttle, Washgton for publication January 30, 1961) catdecreasestheexcitability of over half of the neurons the through what appears to be an active hibition (8). Most of the remag neurons these are excited by similar cortical stimulation, probably via the collaterals from the pyramidal tract that lead to the hilus ventral aspect of the (4). The pyramidal tract has been implicated by Magni et al. (5), who produced a gross potential response the by stimulatg the pyramidal system. The change potential followg pyramidal tract stimulation was similar to that followg stimulation of a peripheral nerve. the present study the response properties of those neurons the that are excited by stimulation of the sensorimotor cortex were vestigated, evidence that the pathway of this excitatory system is deed the pyramidal tract was secured. METHODS STIMULATION ~FTHE SENSORIMOTORCORTEX ofthe Sce these experiments were conducted simultaneously with those on cortical hibition, the basic preparation of the 26 cats the stimulation recordg methods were those described previously (8). addition, the medullary pyramids im six cats were exposed through a ventral approach durg the itial preparation for the experiment. The
Journal of Neurophysiology – The American Physiological Society
Published: Sep 1, 1961
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