THE INFLUENCE OF THE VAGI ON THE MOTILITY OF THE EMPTY STOMACH IN NECTURUS

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Abstract
The contractions of the empty stomach of N. maculatus, recorded by the balloon method, are like those of the bullfrog, but the individual contractions are weaker and the intervals of rest much longer. There are no changes in gastric tonus. Introduction of weak acid or alkali into the empty stomach produces temporary inhibition. Bilateral vagotomy after a prolonged period of gastric inhibition leads to a marked augmentation of the normal contractions by removing the inhibitory influence on the stomach. Electrical stimulation or slight traction on either the sectioned or the unsectioned vagus when the stomach is exhibiting motor activity produces almost immediate inhibition. Stimulation of the central end after unilateral vagotomy results in a reflex inhibition abolished by bilateral vagotomy. In contrast to the action of the vagus on the stomachs of higher animals this nerve is predominantly, if not exclusively, inhibitory in Necturus, while the splanchnic nerves are believed to supply the motor excitatory fibers.

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