[Role of the duodenum in the digestive function. I. Notes on its physiology].

A full account is given of recent advances in knowledge of the physiology of the duodenum. Modern means of diagnosis have shown that this organ, far from having a secondary role in digestive performance, carries out fundamental activities. These are described and it is made clear that the duodenum, on its own account, is the organ of choice for the digestion and absorption of some important nutritive substances. In addition, its motor and, above all, endocrine activity serves to direct the functions of the stomach, the intestine, and the glands attached to the gastroenteric tract (pancreas and bile ducts).