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Fusimotor Endings Responsible for Chain Fibre ‘Driving’ of Primary Sensory Endings in Cat Muscle Spindles

  • I. A. Boyd
  • F. Sutherland
  • E. R. Arbuthnott

Abstract

The effect of stimulation of single static γ axons, in ventral spinal root filaments, on the response of primary sensory endings from tenuissimus muscle spindles in dorsal root filaments was correlated with the ultrastructure of the fusimotor endings of these same axons. Static γ axons causing ‘driving’ of the Ia discharge were stimulated at frequencies from 0 to 150HZ with the spindle at constant length, and when subjected to ramp stretches. Seven spindles were isolated and intrafusal events observed during axon stimulation. The spindles were fixed with glutaraldehyde and reconstructed from serial transverse sections. Ultrathin sections were prepared at several levels of section through all the fusimotor endings.

Keywords

Axon Terminal Muscle Spindle Muscle Length High Stimulation Frequency Muscle Fibre Membrane 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. E.R. Arbuthnott, K.J. Ballard, I.A. Boyd, and F.I. Sutherland (1982), The ultrastructure of cat fusimotor endings and their relationship to foci of sarcomere convergence in intrafusal fibres, J. Physiol. 331: 285–309.PubMedGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • I. A. Boyd
    • 1
  • F. Sutherland
    • 1
  • E. R. Arbuthnott
    • 1
  1. 1.Institute of PhysiologyUniversity of GlasgowGlasgowUK

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