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Nasal mechanoreceptors in guinea pigs
1Department of Comparative Pathophysiology, University of Tokyo, Japan.
Respiration Physiology
|December 1, 1996
Summary
Nasal mechanoreceptors in guinea pigs show low sensitivity to pressure changes and chemical stimuli. Electrophysiological studies revealed limited responses to inspiratory efforts and irritants, suggesting a specialized sensory role.
Area of Science:
- Neuroscience
- Respiratory Physiology
- Sensory Biology
Background:
- The ethmoidal nerve (EN) innervates the nasal cavity, housing mechanoreceptors crucial for respiratory reflexes.
- Understanding these mechanoreceptors' sensitivity is vital for respiratory control and sensory perception.
Purpose of the Study:
- To electrophysiologically characterize nasal mechanoreceptors in the guinea pig ethmoidal nerve.
- To determine their responsiveness to transmural pressure and chemical stimuli.
Main Methods:
- Electrophysiological recordings from 73 mechanoreceptors in 18 guinea pigs.
- Stimulation via tracheal occlusion (inspiratory effort), negative nasal pressure, and nasal probing.
- Assessment of responses to ammonia vapor and distilled water.
Main Results:
- A subset of receptors responded to pressure changes, with a high threshold for negative pressure (-3.87 ± 0.95 kPa).
- Most mechanoreceptors did not respond to ammonia or distilled water.
- Only three touch-responsive receptors showed sensitivity to chemical stimuli.
Conclusions:
- Guinea pig ethmoidal nerve mechanoreceptors exhibit low sensitivity to pressure variations.
- These receptors appear to have limited responsiveness to common noxious chemical stimuli.
- Findings suggest a specialized role for these mechanoreceptors, potentially less involved in detecting irritants.