islets of Langerhans

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islets of Langerhans:

see pancreaspancreas
, glandular organ that secretes digestive enzymes and hormones. In humans, the pancreas is a yellowish organ about 7 in. (17.8 cm) long and 1.5 in. (3.8 cm) wide. It lies beneath the stomach and is connected to the small intestine at the duodenum (see digestive system).
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Islets of Langerhans


the groups of cells in the pancreas of man and vertebrates (except cyclostomes) that form the endocrine part of the organ, secreting the hormones insulin and glucagon into the blood.

The islets of Langerhans are named for the German scientist P. Langerhans, who described them in 1869. In 1901, the Russian scientist L. V. Sobolev proved their endocrine function and established the occurrence of changes in the islets with diabetes mellitus. The dimensions of the islets of Langerhans are 50 to 500 microns, and there are between ten and 20 islets per mg of gland tissue. The islets do not communicate with the gland’s effluent ducts.

The islets of Langerhans develop from tubular processes of the anterior gut and, depending on the type of animal, consist of cells of several types. All animals have α cells and β cells. The granules of α cells are considered to be a form of glucagon deposit; the β cells, of insulin. C cells and D cells (the former have been found in the islets of Langerhans of guinea pigs; the latter, in man and dogs), which lack granules, are converted to α cells and β cells. In all, the tissue of the islets of Langerhans makes up 0.9 to 3.6 percent of the mass of the pancreas in children and 0.9 to 2.7 percent in adults.


References in periodicals archive ?
Programming of the endocrine pancreas by the early nutritional environment.
Sodium cyclamate affects the endocrine pancreas by increasing the area of islets of langerhans.
Many of the symptoms described on pages 7 and 8 are common to both exocrine and endocrine cancers; in addition, cancers of the endocrine pancreas cause other problems (as listed in Table 1).
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The pathology of the endocrine pancreas in diabetes.
The aberrant BA homeostasis during ICP may further contribute to the aetiology of GDM, by affecting FXR and TGR5 signalling in the in the gut and endocrine pancreas.
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When implanted under the skin, the PEC-01 cells are designed to mature and lurther differentiate into insulin-producing beta and other endocrine cells that regulate blood glucose in a manner similar or identical to the normal islets that comprise the endocrine pancreas.
Endocrine Pancreas and Pharmacotherapy of Diabetes Mellitus and Hypoglycemia.
Ontogeny, postnatal development and ageing of endocrine pancreas in Bubalus bubalis.
International specialists review the biology and pathology of the exocrine pancreas; cancer diagnosis and staging; treatments, including emerging strategies such as gene therapy, targeted therapies, and vaccines; and rarer tumors of the endocrine pancreas.