What are the three parts of the small intestine in order?

The three parts of the small intestine, in the correct order, are the duodenum, jejunum, and ileum. This sequence is essential for understanding the anatomy and physiology of the digestive system. The duodenum is the first section, immediately following the pyloric sphincter of the stomach, and is where initial digestion occurs, with the mixing of chyme and bile. Following the duodenum is the jejunum, which is the middle section and primarily responsible for nutrient absorption. The ileum is the final segment, leading into the large intestine, and it completes the absorption of nutrients and bile salts.

Understanding this order is crucial for medical professionals since each part of the small intestine has distinct roles in digestion and absorption, and knowing their arrangement assists in diagnosing and treating gastrointestinal disorders effectively.