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Descending pathway from the central pattern generator of vomiting
Neuroreport
|July 28, 1997
Summary
The central pattern generator (CPG) for vomiting directly connects to respiratory premotor neurons. This finding reveals how the CPG controls vomiting motions in dogs.
Area of Science:
- Neuroscience
- Physiology
Background:
- The central pattern generator (CPG) for vomiting is hypothesized to involve non-respiratory neurons near the retrofacial nucleus.
- CPG neurons generate vomiting patterns analogous to respiratory neurons in the caudal ventral respiratory group (cVRG).
Purpose of the Study:
- To investigate direct neural connections between CPG neurons and cVRG neurons in dogs.
Main Methods:
- Identified 27 non-respiratory neurons as CPG neurons based on vagal stimulation response and vomiting activity.
- Stimulated the cVRG and recorded antidromic responses from identified CPG neurons.
Main Results:
- Nine out of 27 identified CPG neurons showed antidromic responses to cVRG stimulation.
- This indicates a direct synaptic link between CPG neurons and cVRG neurons.
Conclusions:
- The study provides evidence that the CPG directly innervates respiratory premotor neurons in the cVRG.
- This direct CPG-to-cVRG pathway is crucial for generating the motor patterns associated with vomiting.