Differences between steady-state and transient post-synaptic potentials elicited by stimulation of the sural nerve

C. J. Heckman*, J. F. Miller, M. Munson, W. Z. Rymer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

In cat medial gastrocnemius motoneurons, single stimuli to the cutaneous sural nerve evoke a post-synaptic potential with a mixture of depolarization and hyperpolarization, depolarization being dominant in type F cells and hyperpolarization in type S cells. This pattern is consistent with previous reports showing that activation of the sural nerve can sometimes reverse the normal order of motor unit recruitment by inhibiting S motor units while simultaneously exciting F motor units. However, during repetitive stimulation for 1-2 s, we found that the hyperpolarizing component of the sural input to medial gastrocnemius motoneurons was not persistent, but instead gave way to depolarization after the first 30 ms. The net steady-state response after 0.5-1.0 s of stimulation was depolarization in all cells, regardless of motor unit type. This suggests that tonic sural input may be incapable of producing prolonged recruitment reversals.

Original languageEnglish (US)
Pages (from-to)167-170
Number of pages4
JournalExperimental Brain Research
Volume91
Issue number1
DOIs
StatePublished - Oct 1992

Keywords

  • Cat
  • Motoneurons
  • Post-synaptic potential
  • Recruitment
  • Sural nerve

ASJC Scopus subject areas

  • Neuroscience(all)

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