suprachiasmatic nucleus

noun
su·​pra·​chi·​as·​mat·​ic nucleus | \ˌsü-prə-ˌkī-əz-ˈma-tik- \

Definition of suprachiasmatic nucleus 

: 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

Examples of suprachiasmatic nucleus in a Sentence

Recent Examples on the Web

The part of the brain that controls circadian timing is the suprachiasmatic nucleus within the hypothalamus. SELF, "We Asked a Doctor How Much You Need to Care About Your Circadian Rhythm," 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, "Why being a night owl may lead to earlier death," 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, "A Counterintuitive Idea for Treating Severe Depression: Stay Awake," 23 Jan. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'suprachiasmatic nucleus.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of suprachiasmatic nucleus

1938, in the meaning defined above

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Last Updated

14 Nov 2018

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The first known use of suprachiasmatic nucleus was in 1938

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More Definitions for suprachiasmatic nucleus

suprachiasmatic nucleus

noun

Medical Definition of suprachiasmatic nucleus 

: 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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