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Suprasegmental inhibition and facilitation following injection of tetanus toxin into the nuclei of the medulla oblongata concerning the dispatch station phenomenon



Suprasegmental inhibition and facilitation following injection of tetanus toxin into the nuclei of the medulla oblongata concerning the dispatch station phenomenon



Byulleten' Eksperimental'noi Biologii i Meditsiny 79(1): 24-28



Changes in the descending inhibition and facilitation produced by stimulation of the fastigial nucleus of the cerebellum after injection of tetanus toxin into the relay nuclei of the medulla oblongata were studied in cats under light nembutal-chloralose anesthesia. Injection of tetanus toxin into the nuclei was followed by an increase in the functional dispatch formed in them. This was manifested by a repeated increase in the descending inhibition (for injection of tetanus toxin into the giganto-cellular nucleus) and the descending facilitation (for injection of the toxin into the Deiter's nucleus and the ambiguus nucleus), by a considerable shortening of the latent periods of the descending effects, and by a sharp increase in their maximum intensity and marked lengthening. These results may be due to formation of powerful excitation generators in the complex relay switching connected with disturbances of the inhibitory mechanisms and they extend the dispatch station concept as applied to supraspinal structures.

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Accession: 006546161

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