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Motoneuronal Regulation of Central Pattern Generator and Network Function.

Mélanie Falgairolle1, Michael J O'Donovan2

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|September 6, 2022
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Summary
This summary is machine-generated.

Vertebrate motoneurons initiate rhythmic activity in developing spinal cords and influence central pattern generators. These findings suggest motoneurons are integral components of neural circuits controlling movement.

Keywords:
Calcium imagingCentral pattern generatorLocomotionMotoneuronOptogenetics

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Motor Control

Background:

  • Spinal cord circuits generate rhythmic motor patterns.
  • The role of motoneurons in initiating and modulating these patterns is increasingly recognized.

Purpose of the Study:

  • To review recent findings on motoneuron-driven rhythmic activity in the spinal cord.
  • To explore the involvement of motoneurons in central pattern generators (CPGs) across development.

Main Methods:

  • Antidromic activation of motoneurons in embryonic chick and fetal mouse spinal cords.
  • Optogenetic manipulation of motoneuron firing in neonatal mice.
  • Observation of motoneuron regulation of swimming and vocalization in adult vertebrates.

Main Results:

  • Antidromic motoneuron activation triggers rhythmic activity in developing spinal cords.
  • Motoneuron firing modulates the frequency of fictive locomotion.
  • Motoneurons regulate motor behaviors like swimming and vocalization in adult animals.

Conclusions:

  • Vertebrate motoneurons play a crucial role in initiating and modulating spinal cord rhythmic activity.
  • Motoneurons are functionally integrated into central pattern generators throughout development and in adult animals.