Letter | Published:

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

Nature volume 257, pages 240241 (18 September 1975) | Download Citation

Subjects

Abstract

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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Author information

Affiliations

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

    • YASUSHI FUKAMI

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DOI

https://doi.org/10.1038/257240a0

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