title: [Ultrastructure of the secretory cells of the pancreatic islets in human fetuses].
abstract: An electron microscopic study of pancreatic islets of human fetuses 16--28 weeks old discovered four types of secretory cells -- B, A, D and type IV, which has not yet been given a generally accepted name. These cells contain small secretory granules more dense than granules D. In three cases endocrine elements with "mixed" granulation (D--A) were noted. The formation of insulin- and glucagon-containing granules in the ergastoplasm and Golgi complex was observed. The hormone secretion is realized by emyocitosis.
mesh_terms: D000367:Age Factors; D004721:Endoplasmic Reticulum / Q000648:ultrastructure; D005333:Fetus / Q000648:ultrastructure*; D006056:Golgi Apparatus / Q000648:ultrastructure; D006801:Humans; D007515:Islets of Langerhans / Q000196:embryology / Q000378:metabolism / Q000648:ultrastructure*; D010179:Pancreas / Q000196:embryology*
vernacular_title: Ul'trastruktura sekretornykh kletok pankreaticheskikh ostrovkov u plodov cheloveka