| Abstract: | We carried out intracellular recording from neurons of Clarke's column of the spinal cord of a cat. It is demonstrated that relay neurons of the dorsal spino-cerebellar tract — which are activated by proprioceptive fibers from one muscle only — are not subject to corticofugal postsynaptic control, in contrast to neurons on which excitory and inhibitory influences converge from various groups of afferents. The corticofugal effects in such neurons coincide in direction with effects evoked by flexor reflex afferents. Properties are described of neurons that are situated in the vicinity of Clarke's column but are not relay neurons of the DSCT. The hypothesis is expressed that these neurons are identical to the "border cells" — short-axon interneurons on which axonic collaterals of relay neurons terminate.A. A. Bogomolets' Institute of Physiology, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Neirofiziologiya, Vol. 1, No. 1, pp. 15–24, July–August, 1969. |
