Abstract
When an isolated cat muscle spindle is subjected to a ramp and hold stretch the primary sensory annulo-spiral round the dynamic bag1 (Db1) fibre is extended and then creeps back part way towards its original state over several seconds since the poles of the fibre give way (Boyd, 1976). This ‘creep’ at the final length is small, or absent, when the fibre is inactive, and is greatly enhanced by activation of the fibre (Fig. 1; Boyd, Gladden & Ward, 1981). The length sensitivity of the primary sensory ending is greatly increased during the dynamic phase of stretching, but the static length sensitivity is little increased because the creep causes pronounced slow adaptation of the Ia discharge (Fig. 2).
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References
Boyd, I. A., 1976, The mechanical properties of dynamic nuclear bag fibres, static nuclear bag fibres and nuclear chain fibres in isolated cat muscle spindles, Prog. Brain Res., 44:33–50.
Boyd, I. A., and Gladden, M. H., 1985, “The Muscle Spindle”, Macmillan, London.
Boyd, I. A., Gladden, M. H., and Ward, J., 1981, The contribution of mechanical events in the dynamic bag., intrafusal fibre in isolated cat muscle spindles to the form of the Ia afferent axon discharge, J. Physiol., 317:80–81P.
Poppele, R. E., 1985, Relation between intrafusal muscle mechanics and the sensitivity of spindle sensory endings, in: “The Muscle Spindle”, pp.167–171, I. A. Boyd and M. H. Gladden, eds., Macmillan, London.
Poppele, R. E., and Quick, D. C., 1981, Stretch induced contraction of intrafusal fibres in the cat muscle spindle, J. Neurosci. 1:1069–1174.
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© 1988 Springer Science+Business Media New York
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Boyd, I.A., Gladden, M.H., Halliday, D., Dickson, M. (1988). Stroboscopic Cinematographic and Videorecording of Dynamic Bag1 Fibres During Rapid Stretching of Isolated Cat Muscle Spindles. In: Hník, P., Soukup, T., Vejsada, R., Zelená, J. (eds) Mechanoreceptors. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-0812-4_39
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DOI: https://doi.org/10.1007/978-1-4899-0812-4_39
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