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Identification and discharge patterns of spinal sympathetic interneurons
The American Journal of Physiology
|September 1, 1976
Summary
Researchers identified sympathetic interneurons in the spinal cord using R wave correlation. These interneurons exhibit distinct firing patterns compared to preganglionic neurons, aiding in differentiation.
Area of Science:
- Neuroscience
- Physiology
Background:
- Sympathetic nervous system regulation is crucial for cardiovascular control.
- Distinguishing between sympathetic interneurons and preganglionic neurons is essential for understanding neural pathways.
Purpose of the Study:
- To identify and characterize sympathetic interneurons within the cat thoracic spinal cord.
- To differentiate these interneurons from preganglionic sympathetic neurons.
Main Methods:
- Correlating spontaneous neuronal discharge with the R wave of the electrocardiogram (ECG).
- Testing for antidromic activation following stimulation of the cervical sympathetic nerve.
- Analyzing discharge patterns, including burst firing and response to medullary stimulation.
Main Results:
- Fifteen sympathetic interneurons were identified, showing a positive post-R wave relationship and burst firing patterns.
- These interneurons differed significantly from preganglionic neurons in discharge frequency and response to stimulation.
- Spinal sympathetic inhibition was found to act at the interneuronal level.
Conclusions:
- The post-R wave time interval histogram and antidromic activation testing effectively differentiate spinal sympathetic interneurons from preganglionic cells.
- Sympathetic inhibition within the spinal cord involves interneurons.
- No evidence for inhibitory interneurons in the intermediolateral cell column was found.