islands of Langerhans


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islands of Langerhans

(ī′ləndz; läng′ər-häns′)

islands of Langerhans

[lang′gərhanz]
Etymology: L, insula, island; Paul Langerhans, German pathologist, 1847-1888
clusters of cells within the pancreas that produce insulin, glucagon, and pancreatic polypeptide. They form the endocrine portion of the gland, and their hormonal secretions released into the bloodstream are balanced, important regulators of carbohydrate metabolism. The islands of Langerhans are scattered throughout the pancreas; the beta cells, which secrete insulin, usually appear in the center of each of the lobules. Alpha cells secrete glucagon, and pancreatic peptide cells secrete pancreatic peptide. The cells the islands comprise are arranged in plates interspersed by capillaries. Also called islets of Langerhans.

island

[AS. igland, island]
A structure detached from surrounding tissues or characterized by difference in structure; an islet.

blood island

The early collections of cells in the embryo that give rise to blood and blood-forming organs later in life.

islands of Calleja

Groups of densely packed, small cells in the cortex of the gyrus hippocampi. Synonym: islets of Calleja

islands of Langerhans

Islets of Langerhans.

pancreatic islands

Islets of Langerhans.

island of Reil

Insula (1)..