The jejunum is a part of the small intestine, located between the duodenum and the ileum. It is approximately 2.5 meters long and plays a crucial role in the digestion and absorption of nutrients. The inner lining of the jejunum is covered with tiny finger-like projections called villi, which increase the surface area for nutrient absorption. The jejunum primarily absorbs carbohydrates, proteins, and fats, as well as vitamins and minerals. It is highly vascularized, meaning it has a rich blood supply that helps transport absorbed nutrients to the rest of the body. Proper functioning of the jejunum is essential for overall digestive health.