Common input across motor nuclei mediating precision grip in humans

Gregory B. Hockensmith, Soren Lowell, Andrew J. Fuglevand

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

Short-term synchrony was measured for pairs of motor units located within and across muscles activated during a task that mimicked precision grip in the dominant and nondominant hands of human subjects. Surprisingly, synchrony for pairs of motor units residing in separate muscles (flexor pollicis longus, a thumb muscle, and flexor digitorum profundus, an index-finger muscle) was just as large as that for pairs of units both within the thumb muscle. Furthermore, the high level of synchrony seen across muscles in the dominant hand was absent in the nondominant hand. These results suggest that descending pathways diverge to provide extensive common input across motor nuclei involved in the precision grip and that such divergence might contribute to the preferred use of one hand over the other.

Original languageEnglish (US)
Pages (from-to)4560-4564
Number of pages5
JournalJournal of Neuroscience
Volume25
Issue number18
DOIs
StatePublished - May 4 2005
Externally publishedYes

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Keywords

  • Corticospinal
  • Hand
  • Handedness
  • Motoneuron
  • Motor unit
  • Synchrony

ASJC Scopus subject areas

  • Neuroscience(all)

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