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island (I´land)

In anatomy, any isolated part, separated from the surrounding tissues by a groove, or marked by a difference in structure.insula (2) ; [A.S. Igland]
blood i. an aggregation of splanchnic mesodermal cells on the embryonic yolk sac, with the potentiality of forming vascular endothelium and primitive blood cells.blood islet;
bone i. a macroscopic focus of cortical bone within medullary bone, commonly seen as a dense round or oval opacity on radiographs of the pelvis, femoral head, humerus, or ribs.
i.'s of Calleja dense clusters of very small nerve cells (granule cells) characteristic of the olfactory tubercle at the base of the forebrain.
epimyoepithelial i.'s (ep´e-mI-o-ep´e-the´lI-al) proliferation of salivary gland ductal epithelium and myoepithelium. Characteristic of benign lymphoepithelial lesions and Sjögren's syndrome.
Langerhans' i.'s islets of Langerhans, under islet
pancreatic i.'s islets of Langerhans, under islet
i. of Reil insula (1)


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