Complex composition of synaptic potentials of the rubrospinal neurons to corticofugal impulses.

Complex, multicomponent excitatory postsynaptic potentials (EPSPs) of the red nucleus rubrospinal neurons evoked by stimulation of the sensorimotor cortex and associative field of the parietal cortex were studied in acute experiments on pentobarbitalized cats by the intracellular recording technique. Complex cortical EPSPs were recorded in two-thirds of the studied number of neurons. Monosynaptic nature of the first two components of EPSPs evoked by corticofugal impulses propagating at an average velocity of 18.

Electrophysiological peculiarities of cortical inputs to the cat red nucleus.

Complex multicomponent EPSPs of the red nucleus rubro-spinal neurons evoked by stimulation of the sensorimotor cortex and associative fields of the parietal cortex were studied in acute pentobarbitalized cats by intracellular recording technique. Complex cortical EPSPs were recorded in 2/3 of the neurons studied. Components of the EPSPs in question were distinguished by using stimulation of various frequency and intensity.

Functional properties of the cerebellorubral synapses in the cat.

Facilitation of cerebellorubral transmission was illustrated in nembutalized cats on paired stimulation of the cerebellar nucleus interpositus by an example of monosynaptic EPSPs of the rubrospinal neurons. It was found that the facilitation stated is not determined by the change in the presynaptic volley of impulses. There is reason to believe that the facilitation is determined by specific features of functioning of the cerebellar synapses on the red nucleus neurons.

[Neuronal analysis of the rubro-cerebellar projection in the cat].

Antidromic activation of red nucleus neurons evoked by stimulation of cerebellar nucleus interpositus was studied in nembutalized cats. Neuronal composition of the rubro-cerebellar projection was shown to be determined by two types of red nucleus cells. One is represented by rubro-spinal neurons with axon collaterals projecting to cerebellar nucleus interpositus and affected by synaptic influences from the cerebral cortex and cerebellum.

[Synaptic processes in the rubrospinal neurons evoked by stimulation of the cerebellar nucleus interpositus in the cat].

Activity of red nucleus rubrospinal neurons to electrical stimulation of cerebellar nucleus interpositus was studied in nembutalized cats. Facilitation of cerebello-rubral transmission was shown to take place in the majority of neurons whose focal potentials and EPSPs to paired and frequency stimulation of cerebellar nucleus interpositus were analyzed. The mentioned facilitation was found not to be caused by changes in presynaptic volleys.