Failure of the oculomotor neural integrator from a discrete midline lesion between the abducens nuclei in the monkey

Thomas J. Anastasio, David A. Robinson

Research output: Contribution to journalArticlepeer-review

Abstract

Recent anatomical studies indicate that axons of neurons in the vestibular nuclei, projecting to the contralateral abducens nuclei, cross the midline at the abducens level. These axons then give off collaterals to the contralateral vestibular and prepositus nuclei that may be important for the neural integrator that converts eye-velocity to eye-position signals. We disrupted a subset of these commissural projections by making a small midline lesion between the abducens nuclei in a monkey. The vestibulo-ocular reflex and saccades were still present post-lesion, indicating that premotor drive was intact, but the lesion produced severe post-saccadic drift, indicating failure of the neural integrator. We conclude that commissural projections crossing at the abducens level may be important for oculomotor integration.

Original languageEnglish (US)
Pages (from-to)82-86
Number of pages5
JournalNeuroscience Letters
Volume127
Issue number1
DOIs
StatePublished - Jun 10 1991
Externally publishedYes

Keywords

  • Commissural sysem
  • Midline lesion
  • Oculomotor integrator
  • Post-saccadic drift
  • Velocity storage

ASJC Scopus subject areas

  • Neuroscience(all)

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