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  • 1
    Electronic Resource
    Electronic Resource
    Patterns of fusimotor innervation by γ-efferents in cat peroneus tertius (1983)
    Springer
    Experimental brain research 51 (1983), S. 146-152 
    Details
    ISSN: 1432-1106
    Keywords: Muscle spindles ; γ-Efferents ; Fusmotor innervation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The pattern of γ-efferent innervation of the muscle spindle was investigated in the peroneus tertius muscle of the cat. A number of spindle group Ia afferents were isolated and monitored during tetanic stimulation of isolated γ-axons. The sample was dominated by efferents producing a static fusimotor effect on the afferent. An individual static axon normally projected to less than five but at times as many as seven muscle spindles. Each spindle normally received innervation from three to five static γ-efferents but occasionally up to eight. The number of spindles innervated by a static γ-axon was directly related to the efferent axonal conduction velocity. For each experiment, a probability distribution of the number of fusimotor effects was constructed from all available connections between the muscle spindles and static γ-efferents considered in matrices of four afferents and four efferents. This distribution was then compared to a random binomial distribution. In each of the ten experiments, statistically significant differences (p〈0.01) were noted between the experimental and random distributions. In order to interpret such deviations from the random distributions, similar analyses were performed on various combinations of afferents and efferents in simulated sets displaying grouping of effects. It was concluded that the observed differences between experimental and random distributions may be produced by a grouping of fusimotor innervation limited to a small set of spindles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236812
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Histochemical evidence for the existence of skeletofusimotor (β) innervation in the primate (1982)
    Springer
    Experimental brain research 46 (1982), S. 186-190 
    Details
    ISSN: 1432-1106
    Keywords: Muscle spindles ; Skeletofusimotor efferents ; \ Innervation ; Glycogen depletion ; Primate motor control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A total of ten a motor axons which innervated the peroneus brevis muscle were isolated in two cynomolgus monkeys. In each experiment, the isolated α axons were stimulated collectively to deplete glycogen from their muscle units. The muscle was then frozen quickly, cut serially, and stained for glycogen. Of the 52 muscle spindles that were examined, zones of glycogen depletion were found in the intrafusal fibres of 32 spindles. The glycogen-depleted motor units included both fast-twitch and slow-twitch types. Depleted zones were observed in all three types of intrafusal muscle fibres. It was concluded that skeletofusimotor (β) efferents were among the stimulated motor axons. This finding constitutes the first anatomical evidence for the existence of β innervation in the primate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00237175
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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