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A technique for recording from intact phrenic nerve afferents.
1Department of Physiology and Biophysics, University of Kentucky, Lexington 45036.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|November 1, 1987
Summary
This study introduces a novel technique to record phrenic nerve afferent activity from intact dorsal roots. This method aids in understanding how diaphragm afferents control respiratory motor drive.
Area of Science:
- Neuroscience
- Respiratory Physiology
Background:
- Phrenic nerve afferents are known to influence respiratory motor drive.
- Understanding the specific roles of these afferents is crucial for respiratory control research.
Purpose of the Study:
- To present a new technique for recording single phrenic nerve afferent activity from intact dorsal root filaments.
- To facilitate the study of diaphragm afferent roles in respiratory motor control.
Main Methods:
- Recording single phrenic nerve afferent activity from cervical dorsal roots (C4-C6) in anesthetized cats.
- Utilizing fine tungsten wire probes for isolating intact dorsal root filaments.
- Classifying fibers by conduction velocity and recording their activity.
Main Results:
- Successfully recorded from 38 phrenic nerve afferent fibers.
- Observed tonic activity in 21 fibers and respiratory-related activity in 15 fibers.
- Conduction velocities ranged from 2.2 to 103 m/s, with about half below 20 m/s.
Conclusions:
- The developed technique allows for phrenic nerve afferent recording while preserving reflex pathways.
- This method is valuable for investigating the contribution of diaphragm afferents to respiratory motor control.