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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Biological cybernetics 7 (1970), S. 72-77 
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Summary The depolarization of the sensory terminals of muscle spindle primary endings is studied in terms of a simplified core conductor model of the system. The terminals branching from a group Ia afferent fibre have different geometrical structures, depending on whether they innervate the nuclear bag or the nuclear chain intrafusal fibres of a muscle spindle. The depolarization of the two different structures as a function of space and time is analysed by digital simulation technique. The studies indicate that the tapered core conductor model of the bag-fibre terminals responds faster than a uniform system similar to the terminals innervating the nuclear chain fibres. The steady state response, on the other hand, appears to supply a more effective depolarization in the case of a uniform system with otherwise equivalent parameters. The results suggest that the bag fibre terminals are best suited for converting dynamical stimuli into an electrical signal, whilst the chain fibre terminals seem to yield a more effective steady state response. The results are discussed in relation to the functional properties of the mammalian muscle spindles and in relation to the earlier proposed models of the mechanical system represented by the two types of intrafusal muscle fibres.
    Type of Medium: Electronic Resource
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