<Tr> <Th> Oxytocin </Th> <Td> OXY or OXT </Td> <Td> Magnocellular neurosecretory cells of the paraventricular nucleus and supraoptic nucleus </Td> <Td> Uterine contraction Lactation (letdown reflex) </Td> </Tr> <Tr> <Th> Vasopressin (antidiuretic hormone) </Th> <Td> ADH or AVP </Td> <Td> Magnocellular and parvocellular neurosecretory cells of the paraventricular nucleus, magnocellular cells in supraoptic nucleus </Td> <Td> Increase in the permeability to water of the cells of distal tubule and collecting duct in the kidney and thus allows water reabsorption and excretion of concentrated urine </Td> </Tr> <P> It is also known that hypothalamic - pituitary - adrenal axis (HPA) hormones are related to certain skin diseases and skin homeostasis . There is evidence linking hyperactivity of HPA hormones to stress - related skin diseases and skin tumors . </P> <P> The hypothalamus coordinates many hormonal and behavioural circadian rhythms, complex patterns of neuroendocrine outputs, complex homeostatic mechanisms, and important behaviours . The hypothalamus must, therefore, respond to many different signals, some of which generated externally and some internally . Delta wave signalling arising either in the thalamus or in the cortex influences the secretion of releasing hormones; GHRH and prolactin are stimulated whilst TRH is inhibited . </P>

Neurons in the hypothalamus are responsible for the production of