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Related Experiment Videos

Desynchronized respiratory rhythms and their interactions in cats with split brain stems.

F L Eldridge1, D Paydarfar

  • 1Department of Medicine, University of North Carolina, Chapel Hill 27599.

The Journal of Physiology
|March 1, 1989
PubMed
Summary

Splitting the cat medulla desynchronized phrenic nerve rhythms, causing amplitude modulations. These interactions, mediated by corollary discharge, were eliminated by spinal cord splitting, revealing brainstem-spinal cord respiratory control mechanisms.

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Area of Science:

  • Neuroscience
  • Respiratory Physiology

Background:

  • The phrenic nerves control diaphragm activity for breathing.
  • Medullary splitting affects respiratory rhythm generation.

Purpose of the Study:

  • To investigate the effects of sagittal splitting of the medulla on phrenic nerve activity and rhythms.
  • To explore the neural mechanisms underlying respiratory rhythm modulation.

Main Methods:

  • Mid-line sagittal splitting of the medulla in anesthetized, paralyzed, and ventilated cats.
  • Recording phrenic nerve activity.
  • Manipulating respiratory drive (hypercapnia, drugs, electrical stimulation).
  • Further spinal cord splitting at C5-C6 level.

Main Results:

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  • Splitting the medulla above the obex decreased phrenic activity but did not desynchronize rhythms.
  • Splitting below the obex led to desynchronized phrenic rhythms.
  • Desynchronized rhythms showed amplitude modulations ('magnet' effect) due to interactions.
  • Modulations were abolished after spinal cord splitting at C5-C6.

Conclusions:

  • Respiratory rhythm generators are located in the medulla.
  • Interactions between medullary halves influence phrenic nerve activity amplitude.
  • A corollary discharge mechanism, crossing the midline at C5-C6, likely mediates these modulations.