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.
Histology of Pancreatic Islets of Langerhans. 1-two million Islets in human 2- in the islets the cells are arranged in irregular chains and cords separated by a rich blood supply; 3- cells in islets: alpha cells (70%) secrete insulin and beta cells(20%) secrete glucagon.