Abstract
Endocrine organs are richly vascularized ductless organs that produce hormones. The epithelial cells of the organ secrete their hormone product directly into the bloodstream where, upon binding with specific receptors in target organs, cellular functions are affected. The endocrine system includes not only the endocrine glands (pineal, pituitary, thyroid, parathyroid, and adrenal) but also single cells and small clusters of cells in the thorax and abdomen known as paraganglia. This chapter addresses the thyroid, parathyroid, adrenal, pituitary and pineal glands, and paraganglia. In addition to size differences, several features of endocrine tissues differ between rodents and humans, and often between rodents.
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