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Related Experiment Videos

Nasal 'pressure' receptors.

H Tsubone1

  • 1Department of Animal Environmental Physiology, Faculty of Agriculture, University of Tokyo, Japan.

Nihon Juigaku Zasshi. the Japanese Journal of Veterinary Science
|April 1, 1990
PubMed
Summary

Researchers identified nasal pressure receptors in the ethmoidal nerve of rats. These receptors, primarily sensitive to negative pressure, may help maintain upper airway patency during breathing.

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Area of Science:

  • Neuroscience
  • Respiratory Physiology

Background:

  • Upper airway patency is crucial for respiration.
  • Nasal receptors play a role in respiratory reflexes.
  • The trigeminal nerve innervates nasal structures.

Purpose of the Study:

  • To identify nasal receptors responding to upper airway pressure changes.
  • To investigate the role of ethmoidal nerve fibers in respiratory mechanics.

Main Methods:

  • Recording afferent activity from single ethmoidal nerve fibers in anesthetized rats.
  • Applying controlled negative and positive pressures to the upper airway during nasal occlusion and tracheostomy.
  • Measuring airway pressure, nerve fiber activity, and muscle EMG.

Main Results:

  • Twenty-two afferent fibers responded to negative nasal pressure during inspiratory efforts.
  • A subset of fibers also responded to positive pressure.
  • No fibers responded to tracheal occlusions, indicating nasal specificity.

Conclusions:

  • The ethmoidal nerve contains nasal 'pressure' receptors, predominantly sensitive to negative pressure.
  • These receptors likely contribute to maintaining upper airway patency.

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