<Tr> <Th> FMA </Th> <Td> 9668 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> The endocrine system is a chemical messenger system consisting of hormones, the group of glands of an organism that carry those hormones directly into the circulatory system to be carried towards distant target organs, and the feedback loops of homeostasis that the hormones drive . In humans, the major endocrine glands are the thyroid gland and the adrenal glands . In vertebrates, the hypothalamus is the neural control center for all endocrine systems . The field of study dealing with the endocrine system and its disorders is endocrinology, a branch of internal medicine . </P> <P> Special features of endocrine glands are, in general, their ductless nature, their vascularity, and commonly the presence of intracellular vacuoles or granules that store their hormones . In contrast, exocrine glands, such as salivary glands, sweat glands, and glands within the gastrointestinal tract, tend to be much less vascular and have ducts or a hollow lumen . A number of glands that signal each other in sequence are usually referred to as an axis, for example, the hypothalamic - pituitary - adrenal axis . </P>

What part of the brain functions as the control center of the endocrine system