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Pancreas development

Similar to the tracheal and hepatic buds and their branches, the peancreatic bud is an evagination of the endoderm which branches profusely to form the liver. This branched endodermal endothelium differentiates into two types of glandular tissue: exocrine glands, which produce essential digestive enzymes that are secreted into the small intestine; and endocrine glands (aka islet of Langerhans or islets) that produce the hormones insulin and glucagon.