The small intestine is made up of the duodenum, jejunum, and ileum. Together with the esophagus, large intestine, and the stomach, it forms the gastrointestinal tract. In living humans, the small ...

This story is part of a series exploring human anatomy and physiology complexities. Each story in this collection showcases discoveries reshaping our understanding of the body's inner workings, ...

The stomach contains something called the pylorus, which connects the stomach to the duodenum. The duodenum is the first section of the small intestine. Together, the pylorus and duodenum play an ...