[Spatial organization of inhibitory control of the activity of the vestibulospinal neurons of Deiter's nucleus by the Purkinje cells in the anterior lobe of the cerebellar cortex].

Peculiarities of topographical distribution of the Deiters nucleus vestibulospinal neurons were studied by means of microelectrode technique. It is shown, in contrast to morphological data, that the localization of antidromically identified vestibulocervical (C-neurons) and vestibulolumbal (L-neurons) cells is not restricted to the ventral mid- and rostral third part (forelimb region) and caudosorsal part (hindlimb region) of the nucleus, but extends correspondingly to the whole ventral and dorsal halves of the nucleus. There is a great overlapping in zones of these two groups of neurons: C-neurons are found in the dorsal portion also, whereas L-neurons--in its ventrocaudal part. Analysis of distribution of monosynaptic IPSPs in the vestibulospinal neurons, evoked in response to the stimulation of the Purkinje cells, has shown that the C-neurons are controlled mainly from the forelimb region of the cerebellar cortex, whereas L-neurons are inhibited from the forelimb as well as from the hindlimb regions of the vermal cortex anterior lobe.