hypothalamus

noun
hy·​po·​thal·​a·​mus | \ ˌhī-pō-ˈtha-lə-məs How to pronounce hypothalamus (audio) \

Definition of hypothalamus

: a basal part of the diencephalon that lies beneath the thalamus on each side, forms the floor of the third ventricle, and includes vital autonomic regulatory centers

Examples of hypothalamus in a Sentence

Recent Examples on the Web Knowing this, the researchers used a technique known as chemogenetics—in which neurons are genetically modified so that they can be activated using a drug—to look for neurons in the hypothalamus responsible for the effect. Simon Makin, Scientific American, "Switch in Mouse Brain Induces a Deep Slumber Similar to Hibernation," 15 June 2020 Higher levels of stress are found in the hypothalamus; lower stress are found in the dorsal lateral frontal cortex. Fox News, "Where does stress live in the brain? Scientists may have the answer," 29 May 2020 Short Term: The hypothalamus starts the SAM pathway by sending signals via nerves to the adrenal glands, which release the hormone adrenaline (aka epinephrine). Bridget Alex, Discover Magazine, "What Science Says About Why You're Stressed and How to Cope," 21 June 2019 Emerging evidence indicates that some hunger hormones that usually act on the hypothalamus also influence the reward circuit. Ferris Jabr, Scientific American, "How Sugar and Fat Trick the Brain into Wanting More Food," 1 Jan. 2016 Temperature sensors in nerve endings, which produce the sensation of being hot or cold, prompt the hypothalamus to initiate adjustments like shivering to warm up or sweating to cool down. Kim Tingley, New York Times, "What Does Our Body Temperature Say About Our Health?," 24 Mar. 2020 Our body temperature is controlled by the hypothalamus, which acts as a thermostat, keeping the temperature of vital organs fairly constant. Kim Tingley, New York Times, "What Does Our Body Temperature Say About Our Health?," 24 Mar. 2020 Because sufferers have normal sweat glands, the theory is that the hypothalamus, a part of the brain that, among other things, tells your glands to produce sweat, is sending these glands a glitchy message. Stephanie Dolgoff, Good Housekeeping, "How to Stop Excessive Armpit Sweat, According to Doctors," 19 Feb. 2020 Scientists suspect that microbes get enteroendocrine cells to release chemicals signaling the hypothalamus—the brain area that keeps our body in balance—to tell us we’re full. Martin Oeggerli, National Geographic, "How trillions of microbes affect every stage of our life—from birth to old age," 17 Dec. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'hypothalamus.' 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 hypothalamus

1896, in the meaning defined above

History and Etymology for hypothalamus

borrowed from New Latin (in a German context), from hypo- hypo- + thalamus thalamus

Note: The term was introduced in an article by the Swiss-born anatomist Wilhelm His (1831-1904), "Ueber das frontale Ende des Gehirnrohres," Archiv für Anatomie und Physiologie: Anatomische Abtheilung, Jahrgang 1893, p. 159. His attributes the suggestion of the word to his colleague "Waldeyer" (the anatomist Heinrich Wilhelm Gottfried von Waldeyer-Hartz, 1836-1921), as a replacement for his own coinage Regio subthalamica.

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Time Traveler for hypothalamus

Time Traveler

The first known use of hypothalamus was in 1896

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Last Updated

19 Jun 2020

Cite this Entry

“Hypothalamus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hypothalamus. Accessed 4 Jul. 2020.

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More Definitions for hypothalamus

hypothalamus

noun
hy·​po·​thal·​a·​mus | \ -ˈthal-ə-məs How to pronounce hypothalamus (audio) \
plural hypothalami\ -​ˌmī How to pronounce hypothalami (audio) \

Medical Definition of hypothalamus

: a basal part of the diencephalon that lies beneath the thalamus on each side, forms the floor of the third ventricle, and includes vital autonomic regulatory centers (as for the control of food intake)

More from Merriam-Webster on hypothalamus

Nglish: Translation of hypothalamus for Spanish Speakers

Britannica.com: Encyclopedia article about hypothalamus

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