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 Islets of Langerhans. The Islets of Langerhans are commonly referred to as islets (pronounced EYE-lets). Islets actually are clusters of cells, with each islet containing 3,000 to 4,000 cells.Scientists estimate there are 1 million islets in a healthy, adult pancreas.They make up only 1 to 2 percent of the entire organ.Within each islet are several types of cells, which work together to regulate blood sugar. One cell type is the beta cell.slets actually are clusters of cells, with each islet containing 3,000 to 4,000 cells. Scientists estimate there are 1 million islets in a healthy, adult pancreas. They make up only 1 to 2 percent of the entire organ.