[Relations between the electric activity of the pyloric sphincter and activities of the stomach and duodenum].

Indwelled electrodes led electrical activity from the stomach, pyloric sphincter and duodenum in hunger, after feeding or administration of carbachol and morphine as well as after transthoracic vagotomy. In intact resting animals the pyloric sphincter develops slow potentials in the rhythm of stomach antral portion and sometimes in the rhythm of duodenum. Acceleration of the slow potentials rhythm occurring after transthoracic vagotomy in the stomach antral portion, develops in the pyloric sphincter as well. Spike activity of the antral portion spreads over to the sphincter depending on amplitude, frequency and duration of the burst of spikes. Migrating myoelectrical complex develops successively in the stomach antral portion and in the pyloric sphincter. During increased activity of the duodenum (after carbachol or morphine) the bursts of spikes in the rhythm of the duodenum slow waves can occur simultaneously in the pyloric sphincter, too.