The jejunum is the midsection of the small intestine, connecting the duodenum to the ileum. It is about 2.5 m long, and contains the plicae circulares, and villi that increase its surface area. Products of digestion (sugars, amino acids, and fatty acids) are absorbed into the bloodstream here.
Not to be confused with the cells of the islets of Langerhans, found in the pancreas, or Langhans giant cell.
The Islets of Langerhans are pockets of endocrine cells in the pancreas. These cells produce glucagon and insulin. They are located near the small intestine. The Islets of Langerhans are pockets of endocrine cells in the pancreas. These cells produce glucagon and insulin. Found in the pancreas, which is located partially behind the stomach in the abdomen, it contains ACINAR cells which are involved in the digestive system.