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Histological nature of glands

Specify the histological nature of glands? Explain how are they formed?

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The glands are the epithelial tissues. They are generally made up of the epithelium which during embryonic development invaginated in the other tissues. Within exocrine glands, the invagination has preserved the secretion ducts. In the endocrine glands, the invagination is complete and there occurs no secretion ducts.

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