单词	suprachiasmatic nucleus
释义	suprachiasmatic nucleus noun su·​pra·​chi·​as·​mat·​ic nucleus ˌsü-prə-ˌkī-əz-ˈma-tik-  : either of a pair of neuron clusters in the hypothalamus situated directly above the optic chiasma that receive photic input from the retina via the optic nerve and that regulate the body's circadian rhythms Example Sentences Recent Examples on the Web The suprachiasmatic nucleus is wired directly to the retina, and in the 1980s, it was confirmed that the brain clock could be calibrated by sunlight or artificial light, which signals when it’s daytime. New York Times, 6 July 2022 In 1972, scientists discovered that that cycle is mediated by an area in the brain’s hypothalamus called the suprachiasmatic nucleus. New York Times, 6 July 2022 Our mastermind’s lair is a compartment of the brain called the suprachiasmatic nucleus (S.C.N.), containing only 50,000 of the 86 billion neurons in our body. New York Times, 7 May 2020 For years, the cells of the suprachiasmatic nucleus were thought to be alone in having their own clock, controlling all the rhythms in the rest of the body remotely. Quanta Magazine, 15 Sep. 2015 Just a year later, researchers reported that a tiny patch of cells in the brain called the suprachiasmatic nucleus was necessary for a 24-hour circadian rhythm in mammals. Quanta Magazine, 15 Sep. 2015 The part of the brain that controls circadian timing is the suprachiasmatic nucleus within the hypothalamus. SELF, 4 Sep. 2018 Exposure to bright light stimulates the brain’s master clock — the suprachiasmatic nucleus — to wind back those three-tenths of an hour. Brian Resnick, Vox, 27 Apr. 2018 Bright light, meanwhile, is known to alter the rhythms of the suprachiasmatic nucleus, as well as boosting activity in emotion-processing areas of the brain more directly. Linda Geddes, Smithsonian, 23 Jan. 2018 See More Word History First Known Use 1938, in the meaning defined above Medical Definition suprachiasmatic nucleus noun : either of a pair of neuron clusters in the hypothalamus situated directly above the optic chiasma that receive photic input from the retina via the optic nerve and that regulate the body's circadian rhythms —abbreviation SCN
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