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.
1 Langerhans cell histiocytosis is a type of cancer that can damage tissue or cause lesions to form in one or more places in the body. 2  Family history or having a parent who was exposed to certain chemicals may increase the risk of LCH.3  The signs and symptoms of LCH depend on where it is in the body.angerhans cell histiocytosis (LCH) is a rare cancer that begins in LCH cells (a type of dendritic cell which fights infection). Sometimes there are mutations (changes) in LCH cells as they form. These include mutations of the BRAF gene.