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The activity of cerebellar neurones of an elasmobranch fish (Scyliorhinus canicula) during a reflex...
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Zeitschriftentitel: | The Journal of Physiology |
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Personen und Körperschaften: | , |
In: | The Journal of Physiology, 321, 1981, 1, S. 369-383 |
Format: | E-Article |
Sprache: | Englisch |
veröffentlicht: |
Wiley
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Schlagwörter: |
Zusammenfassung: | <jats:p>1. Response of neurones in the corpus cerebelli of <jats:italic>Scyliorhinus canicula</jats:italic> (Elasmobranchii) have been recorded in decerebrate unanaesthetized fish during the performance of pectoral fin reflexes (p.f.r.) evoked by electrical stimulation of the fins.</jats:p><jats:p>2. Of 421 single units recorded in the posterior dorsal quadrant of the corpus, 111 (26%) had their discharges modulated when the reflex was evoked; fifty nine were Purkinje (P) cells discharging single spikes, thirteen were P cells discharging complex responses, thirty‐six were stellate (S) cells and three were not positively identified.</jats:p><jats:p>3. The responses of fifty‐one units (thirty‐seven P cells and fourteen S cells) were analysed in detail. In thirty‐one of the P cells and all the S cells the initial response was excitatory, six P cells gave an inhibitory response only and a further three were inhibited after the initial excitation. Only one S cell had an inhibitory component in its response.</jats:p><jats:p>4. The discharges of the S cells completely overlapped the inhibitory responses of the P cells.</jats:p><jats:p>5. Only one cell (a P cell) was evoked at a latency shorter than that of the p.f.r. In one other P cell discharging single spikes spontaneously, the evoked response was a long latency (146 msec) complex response. Four other P cells discharged only complex responses but the pattern of their response to the p.f.r. was similar to that of P cells discharging single spikes only.</jats:p><jats:p>6. No cerebellar responses were evoked if the fin stimulus was below the threshold necessary to evoke a p.f.r. In curarized fish, unit responses were recorded that were qualitatively similar to those recorded in unparalysed fish.</jats:p><jats:p>7. These results suggest that (i) because of the long latency of the responses, the cerebellum is unlikely to have a role in the initiation of the p.f.r.; (ii) the responses during the p.f.r. were evoked via a mossy fibre‐parallel fibre pathway; (iii) the responses were correlated with motor activity rather than sensory input.</jats:p> |
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Umfang: | 369-383 |
ISSN: |
0022-3751
1469-7793 |
DOI: | 10.1113/jphysiol.1981.sp013990 |