The relationship of afterhyperpolarizations of extraocular motoneurons to membrane potential

N. H. Barmack

Research output: Contribution to journalArticle

Abstract

The effect of membrane potential displacements caused by external current injection on the amplitudes of two antidromically evoked afterhyperpolarizations (AHP1 and AHP2) was measured in extraocular motoneurons. AHP1 had a reversal potential of –70m V and an average compensation for displacements from the reversal potential (“compensation gain”) of –0.36. AHP2 had a reversal potential of –80mV and a compensation gain of –0.08. Measurements of input resistance of these motoneurons demonstrate a 30–50% decrease at depolarized membrane potentials. This rectification could account for the apparent lack of summation of AHP2. The functional role of AHP1 and AHP2 in the regulation of discharge frequencies of extraocular motoneurons during normal eye movements is discussed.

Original languageEnglish (US)
Pages (from-to)433-438
Number of pages6
JournalJournal of Neuroscience Research
Volume2
Issue number5-6
DOIs
StatePublished - 1976

Keywords

  • afterhyperpolarization
  • extraocular
  • eye movements
  • motoneurons

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience

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