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Related Experiment Videos

Corticospinal system development depends on motor experience.

John H Martin1, Michelle Choy, Seth Pullman

  • 1Center for Neurobiology and Behavior, Columbia University, New York, New York 10032, USA. jm17@columbia.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 6, 2004
PubMed
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Early limb use is crucial for refining the corticospinal (CS) tract. Preventing motor activity during development impairs CS terminations and leads to deficits in grasping, demonstrating the necessity of motor experience for normal neural development.

Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Motor Control

Background:

  • Early motor experiences are vital for skill development.
  • The precise role of motor experience in shaping the corticospinal (CS) tract remains unclear.

Purpose of the Study:

  • To investigate the importance of early motor experience in the developmental refinement of the corticospinal tract.
  • To determine if limb use influences the topographic specificity and branching of CS terminations.

Main Methods:

  • Induced temporary muscle paralysis in cats using botulinum toxin A during a critical developmental window (postnatal weeks 3-7).
  • Examined corticospinal tract terminations using anterograde tracers at week 8 and in maturity.
  • Assessed motor behavior using a prehension task (reaching and grasping) at week 10 and in maturity.

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Main Results:

  • Preventing limb use resulted in defective CS terminations, characterized by reduced topographic distribution, branching, and varicosity density.
  • Motor deficits, specifically a loss of the supination component in grasping, were observed in cats with impaired early limb use.
  • These deficits correlated with impaired CS projections from the motor cortex to the cervical enlargement.

Conclusions:

  • Limb use is essential for refining corticospinal tract terminals into specific, dense clusters.
  • Motor experience is necessary for the normal development and functional maturation of the corticospinal tract and associated motor behaviors.