part of part of contributes to morphology of islet of Langerhans A primitive exocrine pancreas can be found in holocephalan cartilaginous fish; a pancreatic duct directly ending in the gut lumen is connected to a glandular structure made of exocrine cells and associated with cell islets, which comprises three different hormone-producing cell types: insulin, somatostatin and glucagon (Yui and Fujita, 1986) AAO:0010406 Anatomical structure which consists of glands developed from pancreatic ducts in the larvae and secrete insulin.[AAO] BTO:0000991 CALOHA:TS-0741 EFO:0000856 EMAPA:32927 EV:0100130 FMA:16016 GAID:324 MA:0000127 MAT:0000076 MESH:D007515 MIAA:0000076 Mammals, birds, reptiles and amphibians have a pancreas with similar histology and mode of development, while in some fish, the islet cells are segregated as Brockmann bodies.[well established][VHOG] UBERON:0000006 UMLS:C0022131 VHOG:0000646 XAO:0000159 island of Langerhans island of pancreas islets of langerhans pancreatic insula pancreatic islet the clusters of hormone-producing cells that are scattered throughout the pancreas uberon endocrine pancreas endoderm-derived structure cell cluster