islet
(i“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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