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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 42 (1981), S. 249-259 
    ISSN: 1432-1106
    Keywords: Passive movement ; Cerebellar cortex ; Climbing fiber and mossy fiber system ; Granule cells ; Purkinje cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In the decerebrate cat discharges of Purkinje cells with simple and complex spikes as well as granule cell discharges in the c1-zone of lobules Va, b and c of the cerebellar anterior lobe were analyzed during a passive movement of the cat's forepaw. Penetrations were made 50 μm apart along the mediolateral and parasagittal directions, the depth never exceeding 500 μm. The response of the Purkinje cells to the climbing fiber input was surprisingly constant, while simple spike responses of the same cells showed a great variability to the same input. The variability between granule cell discharges recorded at a 50 μm distance from each other was similar to that of the simple spikes of the Purkinje cell. It is assumed that because of a patchy distribution of excited granule cells, two neighbouring Purkinje cells may receive a different information via their parallel fiber inputs. This difference is considered to be responsible for the great variability of their responses to mossy fiber inputs.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 320 (1970), S. 97-110 
    ISSN: 1432-2013
    Keywords: Cerebellar Cortex ; Evoked Potentials ; Visceral Afferents ; Kleinhinrinde ; Evoked Potentials ; Viscerale Afferenzen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Evoked Potentials nach Reizung des N. radialis superficialis und N. splanchnicus wurden an der Kleinhirnrinde untersucht und ihre Verteilung mappiert. Es wurde festgestellt, daß die Potentiale der beiden Afferenzen sich stark voneinander unterscheiden. Die verschiedene Form weist darauf hin, daß beide Afferenzen von der Kleinhirnrinde unterschiedlich verarbeitet werden. Durch Interaktions-, Frequenzversuche und Input-Output-Kurven wurden diese Differenzen analysiert.
    Notes: Summary After stimulation of the superficial radial nerve and the splanchnic nerve, evoked potentials were recorded on the surface of the cerebellum and their distribution mapped. It was shown, that the potentials of both afferents were quite different from each other. The differences in shape indicate that both afferents are differentially organized by the cerebellar cortex. This conclusion was reached through interaction experiments, frequency studies, and input-output-relation.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 314 (1970), S. 68-85 
    ISSN: 1432-2013
    Keywords: Cerebellärer Cortex ; Faserentladungen ; Evoked Potentials ; Cerebellar Cortex ; Fiber Responses ; Evoked Potentials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary To investigate the relationship between the surface evoked potentials of the superficial radial nerve and the splanchnic nerve, and the fiber evoked responses of the cerebellum of the cat was the purpose of the present study. The discharges of the mossy fibers, climbing fibers and Purkinje cell axons were identified and their relationship with the surface-potentials established. The mossy fibers fire with train of spikes in different groups, which probably correspond to impulses transmitted through fibers of different conduction velocities and synchronously with the first positivity of the evoked potential. Climbing fibers respond synchronously with the development of the sharp negative deflection of the evoked potentials and were, for the first time, identified. Finally, the Purkinje cell axons exhibited the same firing pattern as the Purkinje cells. Cutaneous and visceral afferents use not only common elements of the cerebellar cortex but also common pathways, in spite of measurable differences between both afferents.
    Notes: Zusammenfassung Der Zweck der vorliegenden Arbeit war die Beschreibung der Beziehung zwischen den Oberflächen-Evoked Potentials, ausgelöst durch Reizung des N. radialis superficialis und des N. splanchnicus und den evozierten Faserentladungen am Kleinhirn der Katze. Die Entladungen der Moosfasern, Kletterfasern und Axone der Purkinje-Zelle wurden identifiziert und ihre Beziehung zu den Oberflächenpotentialen festgestellt. Die Moosfasern feuern mit Spikesalven und in verschiedenen Gruppen. Diese entsprechen wahrscheinlich Impulsen, die von Fasern mit verschiedener Leitungsgeschwindigkeit fortgeleitet werden und die synchron mit der ersten Positivität der Evoked Potentials sind. Die Kletterfasern stehen in zeitlicher Beziehung zu der Entwicklung der scharfen negativen Ablenkung des EPs und werden zum ersten Male identifiziert. Schließlich weisen die Axone der Purkinje-Zelle dieselben Entladungsmuster auf wie die Purkinje-Zelle selbst. Cutane und viscerale Afferenzen benutzen nicht nur gemeinsame Elemente des cerebellären Cortex, sondern wahrscheinlich auch gemeinsame Leitungswege, obwohl es quantitative Differenzen zwischen beiden Afferenzen gibt.
    Type of Medium: Electronic Resource
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