Anterior pituitary.
Secretion of anterior pituitary hormones is driven by the influence of releasing-or release-inhibiting hormones (factors) that are synthesized in parvocellular neurons of the supraoptic, paraventricular, arcuate and periventricular hypothalamic nuclei. ANTERIOR PITUITARY. The hypothalamus produces releasing and inhibiting hormones that reach the anterior pituitary through the hypothalamic portal system. The superior hypophyseal arteries, which are branches of the internal carotid and posterior communicating arteries, make up the primary plexus. Clearly, robust control systems must be in place to prevent over or under-secretion of hypothalamic and anterior pituitary hormones. A prominent mechanism for control of the releasing and inhibiting hormones is negative feedback. 1. Corticotropin Releasing Hormone (CRH) is released from the hypothalamus in response to stress or low blood glucose. It passes through the hypothalamohypophyseal portal system to the anterior pituitary 2. CRH stimulates the secretion of Adrenocorticotropic Hormone (ACTH) from the anterior pituitary 3. Hypothalamic releasing and inhibiting hormones are carried directly to the anterior pituitary gland via hypothalamic-hypophyseal portal veins. Specific hypothalamic hormones bind to receptors on specific anterior pituitary cells, modulating the release of the hormone they produce. 1. Stimuli within the nervous system increase or decrease the secretion of releasing hormones and inhibiting hormones from neurons of the hypothalamus 2. © A Dictionary of Biology 2004, originally published by Oxford University Press 2004. release-inhibiting hormone (RIH) A hormone that inhibits the secretion of another hormone. The hypothalamus produces several hormones that inhibit the release of hormones by the anterior lobe of the pituitary (adenohypophysis). They include MSH-inhibiting hormone (which inhibits melanocyte-stimulating hormone), prolactin-inhibiting hormone, and somatostatin.
http://neuroscience.uth.tmc.edu/s4/chapter02.html http://macromolonline.8m.com/endo/hormones/adenohyp.htm http://www.vivo.colostate.edu/hbooks/pathphys/endocrine/hypopit/overview.html https://quizlet.com/3418414/releasing-and-inhibiting-hormones-flash-cards/ http://www.vivo.colostate.edu/hbooks/pathphys/endocrine/hypopit/overview.html https://quizlet.com/3418414/releasing-and-inhibiting-hormones-flash-cards/ http://www.encyclopedia.com/doc/1O6-releaseinhibitinghormone.html
site into which releasing hormones or inhibiting hormones