Propagation of electrical spiking activity along the small intestine: intrinsic versus extrinsic neural influences

The Journal of Physiology
L BuenoY Ruckebusch

Abstract

1. The electrical activity of the small intestine of conscious dog, recorded by means of chronically implanted electrodes, was related to the transit time estimated by phenol red infusion and its propagation observed after a single or double transection and following either isolation or removal of a 50 cm jejunal loop. 2. In the fasted dog, the activity was characterized by the propagation of myoelectric complexes at a velocity of 4 cm/min during which the mean transit time averaged 13 min/m. About 2/3 of these complexes were seen to pass beyond a single section and anastomosis of the jejunum with a delay of 15 min. This number was reduced to 1/3 and the delay doubled when a second section was performed 50 cm distally. 3. In dog with an isolated jejunal loop, most of the myo-electric complexes were seen to pass from the proximal intestine to the loop and then to the intestine beyond the sit of anastomosis within 37 min. Some complexes however passed directly through the anastomosis within 30-32 min, affecting or not the loop. Others started on the loop and/or on the intestine beyond the anastomosis. Finally, the total number of complexes recorded on the distal jejunum was greater than on the duodenum, an effect which disappeare...Continue Reading

Citations

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