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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 360 (1975), S. 301-320 
    ISSN: 1432-2013
    Keywords: Cerebellar afferents ; Deiters neurones ; Postsynaptic potentials ; Purkinje cell inhibition ; Somatic afferents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The synaptic input to Deiters neurones evoked by stimulation of peripheral somatic nerves was measured by intracellular recordings. EPSPs with broad receptive fields and latencies which indicate polysynaptic connexions were commonly evoked from the FRA. In other cells, low threshold cutaneous afferents were effective at rather short latencies suggesting oligosynaptic connexions from fast ascending fibres. One example was found of EPSPs due to low threshold muscle afferents. IPSPs due to climbing fibre activation of Purkinje cells as observed in most of the neurones were evoked by cutaneous volleys above 1.5–2.0 T and muscle volleys above 5T (above 3–3.5T in case of Q). Often, IPSPs were evoked by stimulation of nerves, to the segmental level of which the vestibulospinal neurone under investigation projected. A small proportion of cells received short latency IPSPs involving direct fast mossy fibre tracts, which were evoked from low threshold cutaneous afferents. IPSPs due to polysynaptic mossy fibre activation of Purkinje cells were evoked from the FRA bilaterally and from ipsilateral cutaneous afferents at 1.5–2.0T (“prolonged inhibition”). Prolonged excitatory/inhibitory events mediated by mossy fibre pathways may be involved in quadruped locomotion or tother processes making use of a broad motor integration.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 360 (1975), S. 321-336 
    ISSN: 1432-2013
    Keywords: Deiters' nucleus ; Flexor reflex afferents ; Purkinje cell inhibition ; Positive field potentials ; Spino-olivocerebellar paths
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The spatial distribution of inhibitory effects mediated by spino-olivocerebellar pathways and evoked by stimulation of the FRA was studied in Deiters' nucleus by intracellular recordings and extracellular measurements of positive field potentials. At a given recording site individual nerves greatly varied in their effectiveness: Q and Saph, Tib and FDL were usually the most effective, while GS had very little effect. When comparing several recording sites, various patterns of dominating and nondominating nerves were found, resulting in a somewhat patchy distribution of responses. The results were supported by intracellular recordings, which showed that CF-mediated IPSPs can be evoked from a limited number of nerves only. The findings show that a discriminative pattern exists in the FRA-evoked spino-olivocerebellar-mediated inhibition. In addition, Deiters neurones were found in which the inhibition was evoked from a large number of fore- and hindlimb nerves. Such a generalized inhibitory pattern may be involved in interlimb coordination during locomotion.
    Type of Medium: Electronic Resource
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