Each section of the gastrointestinal tract has its own pattern of motility and the whole motor activity results specially from the electric properties of the smooth muscle. In its motor activity the duodenum shows functions of mixture and progression as well as it takes part in the gastric emptying control. The movements of the antrum-pylorus-bulbar are considered a starting point for the intestinal peristaltic movement, including the reverse movements. A progressive decrease of the frequency of the waves of the duodenum is usually found at the terminal ileum. Considering that the duodenum has anatomical, embryological, biochemical and histological characteristics that are distinguished in the digestive physiology, we became interested in the motor reaction of the pre and post papillary section under the pharmacological stimulus. Ten albino rats were used to execute the experiment which was divided in groups I e II, pre and post papillary, respectively. In each section were obtained percentual differences (delta%) of the number of the waves and the maximum amplitude. The groups were analyzed according to the action of the drugs in the group itself as well as the action of each drug compared between these groups. The results showed differences in the (delta%) of the number of the waves under the pharmacological stimulus, when compared to the spontaneous movement. Although, there was no significant difference in the maximum amplitude. It was concluded that the motor reaction, under the pharmacological stimulus of the isolated pre-papillary section of rat is different from the post papillary one.
Intestinal Motility; Intestinal Peristalsis; Duodenal Physiology
