part_of part of part of develops_from develops from develops from contributes to morphology of composed primarily of material entity material entity islet of Langerhans endocrine pancreas endocrine part of pancreas The part of the pancreas that is part of the endocrine system and is made up of islet cells, which produce insulin, glucagon and somatostatin. pars endocrina pancreatis islets of Langerhans part of pancreas endocrine pancreas compound organ component endocrine system pancreas dorsal pancreatic bud endoderm-derived structure