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Human Spinal Motor Control.

Jens Bo Nielsen1

  • 1Department of Neuroscience and Pharmacology and Department of Nutrition, Exercise and Sports, University of Copenhagen, DK-2200 Copenhagen N, Denmark;

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Summary
This summary is machine-generated.

Human brain and spinal cord networks work together for movement. Direct brain control and spinal circuits integrate sensory feedback for complex behaviors.

Keywords:
humanreflexspinal cordvoluntary movement

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Physiology

Background:

  • Human studies reveal intricate collaboration between cortical and spinal networks for diverse behaviors.
  • Direct cortical connections to spinal motoneurons enable willful muscle control, integrating sensory and visual information.
  • Spinal networks are crucial, integrating sensory feedback with central commands for voluntary movement.

Purpose of the Study:

  • To elucidate the collaborative mechanisms of cortical and spinal networks in human motor control.
  • To understand the role of spinal interneurons in regulating motor states like locomotion and stance.
  • To explore how cortical regulation of sensory feedback influences motor commands.

Main Methods:

  • Analysis of human studies over the past three decades.
  • Investigation of direct cortical connections to spinal motoneurons.
  • Examination of sensory feedback integration within spinal circuitries.
  • Study of cortical regulation of presynaptic inhibition.

Main Results:

  • Established direct cortical pathways to spinal motoneurons bypassing interneurons for precise muscle control.
  • Demonstrated integration of somatosensory and visual information at the cortical level for context-dependent motor output.
  • Highlighted the role of spinal interneurons in switching motor states (e.g., locomotion vs. stance).
  • Showcased cortical modulation of presynaptic inhibition to refine sensory feedback pathways.

Conclusions:

  • Cortical and spinal networks exhibit sophisticated collaboration for human behavior.
  • Spinal interneurons are key regulators of motor state transitions.
  • Future research combining human and animal studies will further define the neural basis of human motor control.