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.

[Analysis of the components of synaptic potentials induced by corticofugal spikes in the rubrospinal neurons of the cat].

EPSPs of rubrospinal neurons evoked by stimulation of the sensorimotor cortex were studied in nembutalized cats by means of intracellular recordings. Participation of the corticospinal input in the genesis of EPSPs mentioned was revealed by selective activation of corticospinal fibres on the level of medullary pyramids as well as by studying peculiarities of their interaction with the effects of cortical stimulation. It was shown that both predominantly slow conducting corticospinal and corticorubral neurons participate in the genesis of the first two components of the complex EPSPs.

[Multi-component synaptic potentials of rubrospinal neurons of the cat induced by corticofugal spike trains].

Compound nature of EPSPs in rubrospinal neurons evoked by stimulation of the sensorimotor and associative parietal region of the cerebral cortex was shown in acute experiments on nembutalized cats by means of intracellular technique. Monosynaptic nature of the first two components of EPSPs evoked by corticofugal impulses propagating with an average velocity of 18.5 m/s and 7.

[Postsynaptic processes in rubrospinal neurons of the cat brain exposed to different corticofugal influences].

EPSPs of the red nucleus neurons evoked in response to stimulation of the cerebellar nucleus interpositus as well as the sensorimotor and associative parietal region of the cerebral cortex were studied in acute experiments on nembutalized cats. As in the case of the two previous structures mentioned a monosynaptic connection of the associative cortex with the rubrospinal neurons was shown to exist. Unitary EPSPs having latent periods 1.

Electrophysiological properties of cortical synaptic inputs of rubro-spinal neurons.

Excitatory postsynaptic potentials (EPSPs) of the red nucleus neurons evoked by stimulation of the cerebellar nucleus interpositus as well as the sensorimotor and association parietal regions of the cerebral cortex were studies in acute cats. As for the first two structures, a monosynaptic connection of the association cortex with rubro-spinal neurons was shown to exist. The analyses of the time characteristics of the unitary EPSPs suggested a localization of synapses of fibers from the association cortex closer to the soma when compared with those which originated from axons of the sensorimotor cortical cells.

[Synaptic processes in red nucleus neurons induced in the cat by stimulation of the substantia nigra].

Peculiarities of synaptic processes in red nucleus neurons evoked by stimulation of various parts of substantia nigra and cerebellar interposital nucleus were studied in acute experiments in cats using an intracellular recording technique. Such stimulation is stated to induce mono- and polysynaptic activation of the rubrospinal neurons. Great similarity is found in developing monosynaptic cerebellar and nigral excitatory effects.