Abstract
Data accumulated from studies of several species indicate that sex steroids are metabolized by neuroendocrine tissues in a manner analogous to that of other target tissues. Evidence that androgens or their estrogenic metabolites affect the morphology and function of the nervous system in fetal, newborn, developing, and adult rats is presented. The destruction of neural processes subsequent to the administration of large doses of estrogen to intact rats can now be added to the previously known effects on synaptogenesis, cell morphology, and function. We believe this destruction to be a form of chemical deafferentation and that it may underlie age-related hypothalamic failure and the development of multifollicular ovaries in the rat. Implications for other species are not clear at present.
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