Relations between the brain and the endocrine system from its chronobiological aspects. II. The hypophysis, adrenal gland, thyroid islet organ, gonads and kidney

The presence of biorhythms in the endocrine organs (pituitary gland, adrenal gland, thyroid gland, islet organ, gonades , and kidney) are reviewed. Biorhythms ( circadian and circannual rhythms) have an influence on the action of this organs. The acrophases of the hormones in the serum have different peaks and their time-correlation is different. The importance of this data for experiments and for the clinical practice is discussed.