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.
On infection of an area of skin, the local Langerhans' cells will take up and process. microbial antigens before travelling to the T-cell areas in the cortex of the draining lymph node. and maturing to become fully-functional antigen-presenting cells.