preoptic nucleus


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preoptic nucleus

A pair of hypothalamic nuclei (medial and lateral) in the most anterior sector -- the preoptic region -- of the wall of the third ventricle. Various parts of these nuclei appear to inhibit arousal during sleep, influence temperature regulation, influence the perception of thirst, regulate the release of gonadotropins from the anterior pituitary (adenohypophysis), and influence sexual behaviors.
See also: nucleus
References in periodicals archive ?
Proteome analysis of the medial preoptic nucleus (MPN) in di(2ethylhexyl) phthalate (DEHP)-exposed males.
Johnson, "The effects of ibotenate lesions of the median preoptic nucleus on experimentally-induced and circadian drinking behavior in rats," Brain Research, vol.
The anteroventral wall of third ventricle (AV3V) that includes the organum vasculosum lamina terminalis (OVLT), the ventral portion of the MnPO, the preoptic periventricular nucleus, and the more medial aspects of the medial preoptic nucleus is an important region that is involved in body fluid and cardiovascular regulation [25, 32, 37].
The LPBN is richly interconnected with medullary regions, including the AP and mNTS, and with forebrain areas implicated in the maintenance of blood pressure and body fluid homeostasis, such as the paraventricular nucleus of the hypothalamus, the central nucleus of the amygdala (CeA), and the median preoptic nucleus (25-32).
Reinforcing sleep inhibition, caffeine also blocks adenosine receptors in the ventrolateral preoptic nucleus, secondarily causing dopamine release in the forebrain.
But when boys hit puberty testosterone starts to act on the area, called the preoptic nucleus, making it larger, the Daily Mail reported.