the contents of endocrine cells in the epithelium of ducts and the number of acino-insular elements in exocrine parenchyma and in pancreatic islets were estimated by means of the dotted method in semithin sections prepared from the pancreas of the human embryos ( 4 -- 7 months of embryogenesis ) and of adult persons ( 40 -- 50 years of age ) .
C0022131
pancreatic islets
C0030274
pancreas