Letter | Published:

Receptor potential and impulse initiation in two varieties of reptilian muscle spindle

Naturevolume 257pages240241 (1975) | Download Citation



AMONG muscle spindles, those in snake and lizard are the simplest in structure, consisting of a single intrafusal muscle fibre innervated by a single sensory and several motor nerve fibres. Two varieties of spindle occur: one type, the long-capsule spindle has a longer and more slender capsule than the other, the short-capsule spindle1. They differ in their responses to stretch; the response of the long-capsule spindle depends mainly on degree of stretch while the short-capsule spindle responds both to velocity and amplitude of stretch2–4.

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  1. 1

    Regaud, C., and Favre, M., Rév. gèn. Histol., 1, 1 (1904).

  2. 2

    Fukami, Y., J. Neurophysiol., 33, 28 (1970).

  3. 3

    Proske, U., J. Physiol., Lond., 205, 289 (1969).

  4. 4

    Proske, U., and Ridge, R. M. A. P., Progr. Neurobiol., 3, 1 (1974).

  5. 5

    Fukami, Y., and Hunt, C. C., J. Anat., 119, 192 (1975).

  6. 6

    Fukami, Y., J. Neurophysiol., 33, 475 (1970).

  7. 7

    Hunt, C. C., and Wylie, R. M., J. Neurophysiol., 33, 1 (1970).

  8. 8

    Hunt, C. C., and Ottoson, D., J. Physiol. Lond. (in the press).

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  1. Department of Physiology and Biophysics, Washington University Medical School, 660 South Euclid Avenue, St Louis, Missouri, 63110



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