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.
Delta cells make up 5% of the pancreatic cells in the Islets of Langerhans and are located variably in the area and release somatostatin, produce somatostatin, which acts within the islets of Langerhan to inhibit the production of both glucagon and insulin, slows GI motility, allowing more time for food to be absorbed.