duodenojeunal

The duodenojejunal junction is the anatomical point where the duodenum, the first section of the small intestine, connects to the jejunum, the second section of the small intestine. This transition is a crucial area for digestion and absorption. The duodenum receives partially digested food from the stomach, mixed with bile from the liver and digestive enzymes from the pancreas. Here, the food undergoes further chemical breakdown. As the chyme, or partially digested food, moves from the duodenum into the jejunum, the primary site for nutrient absorption begins. The jejunum has a highly folded inner surface with villi and microvilli, significantly increasing its surface area for efficient absorption of carbohydrates, proteins, fats, vitamins, and minerals into the bloodstream. The muscular walls of the duodenojejunal junction, like the rest of the intestine, contract in a wave-like motion called peristalsis to propel the food along its path. The junction itself is a relatively narrow passage, and its functional integrity is important for the coordinated movement and processing of food through the small intestine. Any disruption to this area can affect digestion and nutrient uptake.