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Manual dexterity: how does the cerebral cortex contribute?

I Darian-Smith1, M P Galea, C Darian-Smith

  • 1Department of Anatomy and Cell Biology, University of Melbourne, Parkville, Victoria, Australia.

Clinical and Experimental Pharmacology & Physiology
|October 1, 1996
PubMed
Summary
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Manual dexterity relies on rapid sensorimotor information transfer between the brain and spinal cord. Cervical hemisection limits this speed, impairing hand function recovery despite spared pathways.

Area of Science:

  • Neuroscience
  • Primate Motor Control
  • Spinal Cord Injury

Background:

  • Manual dexterity is crucial for primates, involving complex sensorimotor information transfer.
  • Corticospinal neuron populations project in parallel to the spinal cord, enabling rapid information processing.

Purpose of the Study:

  • To investigate the impact of cervical spinal cord hemisection on sensorimotor pathways and hand dexterity recovery in macaques.
  • To identify the factors limiting complete recovery of motor function after spinal cord injury.

Main Methods:

  • Cervical spinal cord hemisection in macaque monkeys.
  • Analysis of corticospinal neuron projections and sensorimotor input using tracer techniques.
  • Assessment of hand and finger movement recovery over time.

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Main Results:

  • Hemisection resulted in immediate hemiplegia with incomplete recovery of hand movements.
  • Only ~10% of corticospinal fibers ('spared' fibers) remained to innervate the spinal cord caudal to the lesion.
  • No regeneration of interrupted pathways was observed; recovery correlated with more economic transmission via spared channels.

Conclusions:

  • Cervical hemisection permanently reduces parallel sensorimotor channels, creating a transmission rate bottleneck.
  • This reduced transmission rate, not the content of information, limits complete dexterity recovery.
  • Observed recovery likely involves synaptic reorganization within the spared pathways.