Pancreatic islets or islets of Langerhans
The islets of Langerhans are the regions of the pancreas that contain its endocrine (hormone-producing) cells.
This is an illustration of the pancreas with a detailed view of a pancreatic islet with endocrine cells. The islet is surround by the pancreatic acini and pancreatic duct.
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"Illustration depicting pancreatic islet."
http://en.wikipedia.org/wiki/Islets_of_Langerhans%23mediaviewer/File:Blausen_0701_PancreaticTissue.png
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