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Related Experiment Videos

Evidence that ventilatory rhythmogenesis in the frog involves two distinct neuronal oscillators.

R J A Wilson1, K Vasilakos, M B Harris

  • 1Department of Medical Physiology, University of Calgary, 330 Hospital Drive, N.W., Calgary, Alberta, Canada T2N 4N1. wilsonr@ucalgary.ca

The Journal of Physiology
|April 17, 2002
PubMed
Summary

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Researchers identified two brainstem sites controlling amphibian breathing. One site regulates lung inflation, while the other controls buccal ventilation, revealing distinct but interacting respiratory oscillators.

Area of Science:

  • Neuroscience
  • Comparative Physiology
  • Respiratory Physiology

Background:

  • Amphibians utilize distinct buccal and lung ventilation mechanisms.
  • The neural control and coordination of these ventilatory behaviors remain largely uncharacterized.

Purpose of the Study:

  • To identify specific brainstem regions responsible for generating and coordinating buccal and lung ventilation in Rana catesbeiana.
  • To investigate the neural circuitry underlying amphibian respiratory control.

Main Methods:

  • Microinjection of AMPA (glutamate agonist) into isolated postmetamorphic brains to identify excitatory loci.
  • Microinjection of GABA (inhibitory neurotransmitter) to assess the role of identified loci.
  • Brainstem transection to evaluate the independence of rhythmogenic sites.

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Main Results:

  • Two rhythmogenic sites were identified: a caudal site (near CN X) influencing buccal bursts and a rostral site (between CN VIII and IX) affecting both buccal and lung bursts.
  • Inhibiting the caudal site suppressed buccal rhythm, while inhibiting the rostral site abolished lung bursts.
  • Both rostral and caudal brainstem sections maintained rhythmogenesis after transection, indicating distinct oscillators.

Conclusions:

  • The amphibian respiratory network comprises at least two interacting oscillators: one for buccal ventilation and one for lung inflation.
  • These findings provide a model for studying coupled oscillators in vertebrate respiratory systems.