Water intake and the neural correlates of the consciousness of thirst

Michael J McKinley, Derek A Denton, Brian John Oldfield, Lisandra B De Oliveira, Michael L Mathai

Research output: Contribution to journalArticleOther

43 Citations (Scopus)

Abstract

Thirst and resultant water drinking can arise in response to deficits in both the intracellular and extracellular fluid compartments. Inhibitory influences mediating the satiation of thirst also are necessary to prevent overhydration. The brain regions that underpin the generation or inhibition of thirst in these circumstances can be categorized as sensory, integrative, or cortical effector sites. The anterior cingulate cortex and insula are activated in thirsty human beings as shown by functional brain-imaging techniques. It is postulated that these sites may be cortical effector regions for thirst. A major sensory site for generating thirst is the lamina terminalis in the forebrain. Osmoreceptors within the organum vasculosum of the lamina terminalis and subfornical organ detect systemic hypertonicity. The subfornical organ mediates the dipsogenic actions of circulating angiotensin II and relaxin. Major integrative sites are the nucleus of the tractus solitarius, the lateral parabrachial nucleus, the midbrain raphe nuclei, the median preoptic nucleus, and the septum. Despite these advances, most of the neural pathways and neurochemical mechanisms subserving the genesis of thirst remain to be elucidated.
Original languageEnglish
Pages (from-to)249 - 257
Number of pages9
JournalSeminars in Nephrology
Volume26
Issue number3
DOIs
Publication statusPublished - 2006

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