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Multiple spontaneous rhythmic activity patterns generated by the embryonic mouse spinal cord occur within a specific

Blaise Yvert1, Pascal Branchereau, Pierre Meyrand

  • 1Laboratoire de Neurobiologie des Réseaux, Unité Mixte de Recherche 5816, Centre National de la Recherche Scientifique and Université Bordeaux 1, 33405 Talence Cedex, France. b.yvert@lnr.u-bordeaux1.fr

Journal of Neurophysiology
|January 16, 2004
PubMed
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Spinal cord development reveals distinct, coexisting rhythms, not smooth changes. Long episodes at embryonic day 14.5 mark network segregation, highlighting specific maturation stages.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Computational Neuroscience

Background:

  • Spontaneous rhythmic activity is crucial for developing neural circuits.
  • Understanding its dynamic evolution is key to neural network maturation.

Purpose of the Study:

  • To detail the day-by-day changes in spontaneous activity within the embryonic mouse spinal cord.
  • To identify distinct rhythmic patterns and their developmental timing.

Main Methods:

  • Electrophysiological recordings of spontaneous neural activity.
  • Analysis of rhythmic patterns across different spinal cord levels (cervical, thoracic, lumbar).
  • Observation of activity evolution from embryonic day E12.5 to E17.5.

Main Results:

Related Experiment Videos

  • A single, synchronized short-episode rhythm was observed on E12.5-E13.5.
  • By E14.5, a second long-episode rhythm emerged, showing regional variations (tonic firing, left/right alternation).
  • Activity patterns shifted significantly by E15.5-E17.5, with network segregation evident at E14.5.

Conclusions:

  • Embryonic spinal cord spontaneous rhythms undergo abrupt, stage-specific changes, not gradual evolution.
  • The emergence and disappearance of specific rhythms (e.g., long episodes at E14.5) signify critical network maturation and specialization events.