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.
The Langerhanâs cells are also found in this layer, these cells interact with the white blood cells and serves as the immune defense. Layers of the Epidermis (from deepest to most superficial layer). Stratum basale (Stratum germinativum). This is the deepest layer of the skin where mitosis occurs.