It is derived from the endoderm of the embryo.
Structure. The pancreas lies inferior to the stomach in a bend of the duodenum.
(i) Alpha cells (about 20%) produce glucagon. Alpha cells are also called A-cells. (ii) Beta cells (about 70%) produce insulin. Beta cells are also called B-cells.
(iii) Delta cells or D-cells (about 5%) produce somatostatin (SS). (iv) PP cells or F-cells (5%), produce pancreatic polypeptide (PP).