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Rhythmic phrenic nerve activity and respiratory activity in spinal dogs
Respiration Physiology
|May 1, 1977
Summary
This study confirms that the phrenic nerves and diaphragm are crucial for respiratory activity in adult dogs with spinal cord transection. Spinal respiratory control involves modulation by afferent reflexes.
Area of Science:
- Neuroscience
- Respiratory Physiology
Background:
- Spinal cord transection in adult animals can lead to loss of voluntary respiratory control.
- Understanding residual respiratory activity is vital for neurological research.
Purpose of the Study:
- To investigate the role of phrenic nerves and diaphragm in respiratory activity after spinal cord transection.
- To explore the mechanisms of spinal respiratory control.
Main Methods:
- Adult dogs underwent spinal cord transection at C1 or C2 under anesthesia.
- Respiratory activity was induced pharmacologically (doxapram HCl) or occurred spontaneously.
- Phrenic nerve activity and intrapleural pressure were monitored.
Main Results:
- Spinal rhythmic respiratory activity was observed and correlated with phrenic nerve activity.
- Artificial respiration modulated phrenic nerve burst frequency, indicating reflex influence.
- The diaphragm and phrenic nerves were identified as key components.
Conclusions:
- The phrenic nerve and diaphragm are essential for spinal respiratory activity.
- Afferent reflexes can modulate spinal respiratory control mechanisms.