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Histological nature of the glands and their formation

Describe histological nature of the glands and their formation?

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The glands are mainly epithelial tissues and are made of epithelium that invaginates into other tissues during the embryonic development. The invagination is preserved secretion ducts in the exocrine glands. In the endocrine glands, the invagination is complete and there are not any secretion ducts.

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