STUDY ON VOMITING RELATED TO THE VESTIBULOAUTONOMIC REFLEX

The purpose of this study was to investigate the neural pathway from t he vestibular labyrinth to the medullary vomiting center in the cat, u sing electrophysiological techniques. During electrical stimulation of the canal nerve, we found conflicting results: the pressure in the st omach sometimes increased, and sometimes decreased. There might be sev eral neural structures between the semicircular canal nerve and the vo miting center in the dorsolateral portion of the reticular formation o f medulla oblongata. Retching or vomiting-like behavior during both re spiration and movement of the stomach was recorded during stimulation at several sites in the lateral medullary reticular formation. However , the evoked unit activities were not always induced by stimulation of the canal nerve.