These hormones regulate the synthesis and secretion of pituitary hormones. It contains several groups of neurosecretory cells called nuclei which produce hormones. Hypothalamus is the part of the forebrain and it regulates a wide spectrum of body functions. A brief account of the structure and functions of all major endocrine glands and hypothalamus of the human body is given in the following sections. In addition to these, some other organs, e.g., gastrointestinal tract, liver, kidney, heart also produce hormones. Pituitary, pineal, thyroid, adrenal, pancreas, parathyroid, thymus and gonads (testis in males and ovary in females) are the organized endocrine bodies in our body. The endocrine glands and hormone producing diffused tissues/cells located in different parts of our body constitute the endocrine system. The human endocrine system is described here. 
Invertebrates possess very simple endocrine systems with few hormones whereas a large number of chemicals act as hormones and provide coordination in the vertebrates.Hormones are non-nutrient chemicals which act as intercellular messengers and are produced in trace amounts.Hormone is a chemical produced by endocrine glands and released into the blood and transported to a distantly located target organ.Endocrine glands lack ducts and are hence, called ductless glands.Source: NCERT Science Textbooks Class 6-12.
Endocrine Glands and Hormones – Hypothalamus, Pituitary Gland, Pineal Gland, Thyroid Gland, Parathyroid Gland, Thymus, Adrenal Gland, Pancreas, Testis, Ovary, Mechanism of Hormone Action.
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