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Related Experiment Videos

Functional studies of motor cortex.

R Porter1

  • 1John Curtin School of Medical Research, Canberra, Australia.

Ciba Foundation Symposium
|January 1, 1987
PubMed
Summary
This summary is machine-generated.

The precentral motor cortex directly excites spinal motor neurons via corticomotoneuronal (CM) fibers, with stronger effects on distal muscles. CM system also mediates disynaptic inhibition, highlighting its role in fine motor control.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Neurophysiology

Background:

  • Understanding neural element function is challenging with increasing synaptic distance from motor neurons.
  • The precentral motor cortex possesses a corticomotoneuronal (CM) projection system, directly linked to motor neurons.

Purpose of the Study:

  • To define the functions of CM elements in the motor cortex.
  • To investigate the excitatory and inhibitory actions of CM fibers on spinal motor neurons.

Main Methods:

  • Cross-correlation analysis was used to study CM elements.
  • Identified CM fibers' targets and their excitatory/inhibitory actions were investigated.

Main Results:

  • CM fibers produce powerful monosynaptic excitation of spinal motor neurons, particularly for distal muscles (fingers, intrinsic hand muscles).

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  • The latency and time-course of CM excitation were characterized, noting small excitatory postsynaptic potential amplitudes.
  • Some motor neurons innervating proximal muscles showed no direct CM excitation, while disynaptic inhibition was observed via interneurons.

    • Conclusions:

    • The CM system plays a crucial role in direct motor control, especially for fine, distal movements.
    • Extensive divergence in CM fiber projections allows for widespread synaptic connections to motor neurons and interneurons, facilitating complex motor commands and modulation.