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Electrophysiological study of functional interrelationships between ventral posterolateral nucleus and lateral parts of the reticular thalamic nucleus

, : Electrophysiological study of functional interrelationships between ventral posterolateral nucleus and lateral parts of the reticular thalamic nucleus. Fiziologicheskii Zhurnal (Kiev) 31(4): 423-428

Responses of ventral posterolateral nucleus (VPL) neurons to electrical stimulation of lateral parts of thalamic reticular nucleus (R1) directly adjacent to VPL were studied in acute experiments on cats anesthetized with thiopental sodium and immobilized with flaxedil. Antidromic responses with latencies within the range of 0.4 and 2.5 ms were recorded in 19 (23.8%) extracellularly studied neurons out of 73 ones. Orthodromic responses were observed in 43.8% of the studied neurons including excitative responses in 26.0% of them. Inhibition in response to R1 stimulation was found in 24 cells out of 38 specially investigated neurons. EPSPs, EPSPs-spikes-IPSPs, antidromic spikes-IPSPs, IPSPs were registered in VPL neurons during intracellular recordings. Comparison of the results obtained in the given research with those obtained previously from the study of VPL neurons reaction to SI stimulation and data available in literature on the VPL ultrastructure permitted concluding that inhibition evoked in VPL neurons by R1 stimulation was stipulated by excitation of inhibitory R neurons, whereas excitation in activation of corticothalamic fibres passing through R1.

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