In humans, the duodenum is a hollow jointed tube about 10-15 inches long connecting the stomach to the jejunum. It begins with the duodenal bulb and ends at the suspensory muscle of duodenum.
The duodenum precedes the jejunum and ileum and is the shortest part of the small intestine, where most chemical secretion takes place.
The duodenum is the first and shortest segment of the small intestine. It receives partially digested food (known as chyme) from the stomach and plays a vital role in the chemical digestion of chyme in preparation for absorption in the small intestine.