Islets of Langerhans - Anatomy and Histology

Anatomy and Histology

There are about one million islets distributed throughout the pancreas of a healthy adult human,:914 each of which measures about 0.2 mm in diameter.:914 Each is separated from the surrounding pancreatic tissue by a thin fibrous connective tissue capsule which is continuous with the fibrous connective tissue that is interwoven throughout the rest of the pancreas.:914 The combined mass of the islets is 1 to 1.5 grams.