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.
islets of Langerhans - cellular masses composed of different cell types that comprise the endocrine portion of the pancreas and are the source of insulin and glucagon. Synonym(s): islet tissue; Langerhans islands; pancreatic islands; pancreatic islets. Langerhans cell granulomatosis. Langerhans cells - dendritic clear cells in the epidermis that are active participants in cutaneous delayed hypersensitivity. Langerhans granule - a small membrane-bound granule first reported in Langerhans cells of the epidermis. Langerhans cells. LanÂ·gerÂ·hans cells. Dendritic clear cells in epidermis, containing distinctive granules that appear rod- or racket-shaped in section, but lacking tonofilaments, melanosomes, and desmosomes.