suprachiasmatic nucleus

noun

su·​pra·​chi·​as·​mat·​ic nucleus ˌsü-prə-ˌkī-əz-ˈma-tik- How to pronounce suprachiasmatic nucleus (audio)
: 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

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Its action on the brain is centered around a part of the hypothalamus, called the suprachiasmatic nucleus, that regulates circadian rhythms in the body. James Myhre & Dennis Sifris, Md, Verywell Health, 24 Sep. 2024 Your circadian rhythm – the internal clock that dictates the sleep/wake cycle – is controlled by the suprachiasmatic nucleus (SCN). Michael Williams, Discover Magazine, 30 Aug. 2021 In vertebrates, a master clock is located in the awesome-sounding suprachiasmatic nucleus, a tiny region of brain cells in the hypothalamus. Dan Hurley, Discover Magazine, 4 Nov. 2016 Our circadian cycle is controlled by a network of cells in the suprachiasmatic nucleus in our brain that are calibrated by cycles of light and dark. Nathaniel Scharping, Discover Magazine, 14 July 2016 Our circadian rhythms are regulated by what scientists call our master circadian clock, located in a region of the brain called the suprachiasmatic nucleus, in the hypothalamus. Nathaniel Scharping, Discover Magazine, 13 June 2021 The circadian rhythm is present in every single cell of your body, guided by the central clock that resides in the suprachiasmatic nucleus region of the brain. Rosemary Braun, Discover Magazine, 12 Sep. 2018 This is because the retina is in direct communication with the suprachiasmatic nucleus, which is the part of the brain that schedules the release of hormones assisting in wakefulness (cortisol) and sleep (dopamine). Mackenzie Wagoner, Vogue, 18 Oct. 2022 Tucked within the human brain’s hypothalamus, the suprachiasmatic nucleus (SCN) is responsible for tracking the body’s time. Joshua Hawkins, BGR, 20 Sep. 2022

Word History

First Known Use

1938, in the meaning defined above

Time Traveler
The first known use of suprachiasmatic nucleus was in 1938

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Cite this Entry

“Suprachiasmatic nucleus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/suprachiasmatic%20nucleus. Accessed 30 Dec. 2024.

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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