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KMID : 0378019860290070063
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New Medical Journal
1986 Volume.29 No. 7 p.63 ~ p.71
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Electrophysiological Study of Auriculovagal Reflex
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Abstract
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This experiment was done to observe the effects of electrical stimulation of auriculotemporal nerve on gastric motility and on the impulse discharges of gastric vagal efferent nerve fiber in cat. The intragastric pressure was recorded through intragastric balloon and the gastric vagal efferent discharges were conditioned in a window discriminator and counted in 2 sec. intervals: The electrical stimulation was done in auriculotemporal nerve and pinching stimulation was done at hind paw and abdominal skin.
The results are as follows:
1. The type I gastric movement showed increased intragastric pressure of 141±3 ,mmH2O at pinching stimulation of hind paw. The sympathetic influence on gastric motility was excluded by denervating the bilateral greater splanchnic nerve.
2. The mechanical stimulation of hind paw increased the impulse discharges of gastric vagal efferent by 8-14 counts per 2 second.
3. After denervation of bilateral greater splanchnic nerve, the gastric motility didn´t show remarkable changes at abdominal skin stimulation.
4. The gastric vagal efferent discharges was not affected by the denervation of the greater splanchnic nerve.
5. At electrical stimulation of auriculotemporal nerve, the intragastric pressure was increased up to 132±2 mmH2O.
6. At simultaneous stimulation of the hind paw and auriculotemporal nerve, the intragastric pressure change showed increased amplitude and increased duration compared to single stimulation.
7. The gastric vagal efferent discharges were increased by 5-9 counts per 2 second during the electrical stimulation of auriculotemporal nerve.
8. At, simultaneous stimulation of the hind paw and auriculotemporal nerve, the gastric vagal efferent discharges were increased and showed increased duration of change.
Summarizing above results, the electrical stimulation of auriculotemporal nerve increase the impulse discharges of gastric vagal efferent nerve and facilitated the gastric, motility. It suggests that there may be somatovisceral reflex between auriculotemporal nerve and gastric vagal efferent nerve.
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