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Descending projections from the ventrolateral medulla and cardiovascular control
Pflugers Archiv : European Journal of Physiology
|May 1, 1985
Summary
Neurons in the nucleus paragigantocellularis lateralis (PGL) influence blood pressure regulation. Their activity is modulated to generate diverse cardiovascular adjustments, impacting blood pressure and heart rate.
Area of Science:
- Neuroscience
- Cardiovascular Physiology
Background:
- The nucleus paragigantocellularis lateralis (PGL) is implicated in cardiovascular control.
- Understanding the specific roles of PGL neurons in blood pressure regulation is crucial.
Purpose of the Study:
- To investigate the antidromic responses in PGL neurons.
- To explore the effects of stimulating PGL cell bodies on cardiovascular parameters.
Main Methods:
- Evoked antidromic responses in PGL neurons via stimulation of specific spinal white matter tracts in cats.
- Measured conduction velocities of spinally projecting axons.
- Microinjected D,L-homocysteic acid into PGL to stimulate cell bodies.
- Monitored blood pressure and hindlimb muscle vasculature responses.
Main Results:
- Antidromic responses were successfully evoked, with estimated conduction velocities ranging from 5.0-61 m/s.
- PGL stimulation typically caused a rise in blood pressure.
- Associated cardiovascular changes included tachycardia or bradycardia and alterations in hindlimb vascular tone (dilatation or constriction).
Conclusions:
- Tonically active neurons in PGL likely contribute to setting resting blood pressure levels.
- The output of PGL neurons can be modulated to produce varied cardiovascular adjustments.