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Corticospinal Excitability Modulation During Action Observation
12:33

Corticospinal Excitability Modulation During Action Observation

Published on: December 31, 2013

The Florey lecture, 1987. Corticomotoneuronal projections: synaptic events related to skilled movement

R Porter1

  • 1John Curtin School of Medical Research, Australian National University, Canberra.

Proceedings of the Royal Society of London. Series B, Biological Sciences
|July 22, 1987
PubMed

Insights

Development of corticomotoneuronal connections in infants parallels motor skill growth. These connections are crucial for fine motor control, particularly hand and finger movements, as seen in primate studies.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Motor Control

Background:

  • Infant motor skill development correlates with brain maturation, specifically the growth of direct nerve pathways from the cerebral cortex to spinal cord motoneurons.
  • These corticomotoneuronal connections are a hallmark of primates and are essential for refined limb movements, particularly in the hands.

Purpose of the Study:

  • To investigate the role of corticomotoneuronal connections in the development of fine motor skills during infancy.
  • To understand how these connections facilitate precise muscle control, especially for hand and finger movements.

Main Methods:

  • The study draws parallels between human infant development and observations in primate models (monkeys).
  • Analysis focuses on the structure and function of corticomotoneuronal pathways and their influence on motoneurons innervating distal muscles.

Main Results:

  • Refinement of hand movement control in monkeys is associated with increased development of corticomotoneuronal connections.
  • These connections preferentially excite motoneurons controlling distal muscles, crucial for skilled tasks.
  • Damage to these pathways (pyramidal tracts) results in permanent deficits in forelimb muscle fractionation and independent finger movements.

Conclusions:

  • Corticomotoneuronal connections are fundamental for the development of precise and fractionated movements, particularly in the hands.
  • The maturation of these pathways enables sophisticated motor control essential for complex learned behaviors.

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