[The role of ventrolateral thalamic nucleus in switching of the descending influence over to the rat motor activity].

Facilitated influence of preliminary transection of the rat rubrospinal tract on motor activity and instrumental reflexes recovering after lesion of the red nucleus was more obvious after a chemical lesion rather than the electrolytic lesion. This seems to be due to remaining cerebello-thalamic fibres after a chemical lesion of the red nucleus. A preliminary destruction of the ventrolateral thalamic nucleus was shown to complicate switching of the motor activity in the rats with transected rubrospinal tract and lesioned red nucleus.

[Compensatory rehabilitation processes and instrumental reflexes in rats after neurotoxic lesions in the inferior olive].

Training and recovery of instrumental equilibrium reflexes are impossible after total neurotoxical destruction of the inferior olive in rats. Motor deficits and compensatory rehabilitation processes in rats following 3-acethylpyridine treatment and high transection of the dorso-lateral funiculus of the spinal cord are closely correlated with the degree of the inferior olive destruction. The data obtained revealed an improvement in the motor disturbance and a stabilising of the instrumental reflexes in the rats with subtotal lesion of the inferior olive.

[Antidromal and synaptic activation of the neurons of the associative parietal cortex in cats evoked by impulses from the pontine nuclei proper].

Recording of complex multicomponent oligo- and polysynaptic EPSPs revealed antidromic and synaptic responses in the same parietal cortical neurons which suggested a reciprocal link between pontine nuclei proper and the parietal association cortex in cats. Possible pathways and mechanisms of the ponto-cortical links, are discussed.

[The synaptic inputs of the neurons in the cat parietal associative cortex from the motor cortical area].

In anesthetised cats, antidromic activation as well as mono- and polysynaptic EPSPs to cortical motor stimulation, were shown in the parietal cortex's neurons. Functional significance of the cortico-cortical reciprocal connexion between the motor cortex and the parietal associative cortex, is discussed.