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islet (iĀ“let)   an island.
 

islets of Langerhans  , pancreatic islets  irregular microscopic structures scattered throughout the pancreas and comprising its endocrine portion. They contain the alpha cells, which secrete the hyperglycemic factor glucagon; the beta cells, which secrete insulin, and whose degeneration is one of the causes of diabetes mellitus; and the delta cells, which secrete somatostatin.

Walthard islets  microscopic inclusions of the ovarian germinal epithelium, which have been implicated in the development of Brenner tumors.





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