Abstract
In cat spindles when γ- or β-axons are stimulated the direction of movement of sarcomeres is towards motor end plates. This is true of both bag and chain fibres, with the exception of some extra-capsular contraction sites in bag1 fibres which have no associated motor endings (Banks et al., 1978; Arbuthnott et al., 1982). The method required to obtain this information for human spindles has so far been applied to one spindle only, a spindle from a child. All movement was in fact directed towards motor end plates in dynamis bag1 (Db1), static bag2 (Sb2) and chain fibres. The identification of the Db1 and the Sb2 fibres was made by comparing their speed of contraction (see Gladden, 1985), but morphological differences were also sought. A difference in the conformation of bag fibres close to the equator in spindles of adults (Gladden, 1975) occurred in this and other children’s spindles, and may provide a simple way of recognising human Db1 and Sb2 fibres.
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References
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© 1985 I. A. Boyd and M. H. Gladden
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Gladden, M.H., Wallace, W., Craigen, M.L. (1985). Movement convergence and motor end plate location in a human muscle spindle. In: Boyd, I.A., Gladden, M.H. (eds) The Muscle Spindle. Palgrave Macmillan, London. https://doi.org/10.1007/978-1-349-07695-6_16
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DOI: https://doi.org/10.1007/978-1-349-07695-6_16
Publisher Name: Palgrave Macmillan, London
Print ISBN: 978-1-349-07697-0
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