THE ACTIVITY OF THE CARDIOREGULATORY AND ABDOMINAL SYMPATHETIC NERVES DURING SWALLOWING

  • 岡田 博匡
    Department of Physiology, Tottori University School of Medicine
  • 岡本 恭子
    Department of Physiology, Tottori University School of Medicine
  • 西田 勇
    Department of Physiology, Tottori University School of Medicine

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The changes of the activity of the cardioregulatory and abdominal sympathetic nerves during reflex deglutition were investigated by means of action potential study.<BR>1. The efferent impulses in the cardiac sympathetic nerve were slightly enhanced by pouring the water into the pharyngeal cavity. Then activity was completely inhibited with the occurrence of deglutition. Similar results were obtained by stimulating the central end of the severed superior laryngeal nerve. Such responses could still be evoked after the intravenous administration of succinylcholine.<BR>2. The efferent impulses in the cardiac vagal nerve were slightly increased by the water-pouring. Then activity was transitorily suppressed with deglutition.<BR>3. The tonic activity in the splanchnic nerve, hypogastric nerve and renal branch of the abdominal sympathetic nerves was slightly increased by the water-pouring. Then it was followed by a transitorily complete inhibition which occurred synchronously with each deglutition. Such responses were eliminated by cutting the bilateral glossopharyngeal and superior laryngeal nerves. On the other hand, the activity of the ocular sympathetic nerve was not affected by swallowing.<BR>4. From the experimental results, a diagram showing the activity of the cardioregulatory and vasomotor centers during reflex swallowing was represented.

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