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Description: Functional MRI scans show brain activation produced by osmometric thirst. (a) Activation in the anterior cingulate cortex and hypothalamus, corresponding to a sensation of thirst. (b) Activation in the lamina terminalis, the location of the brain’s osmoreceptors. (From Egan, G., Silk, T., Zamarripa, F., et al. Proceedings of the National Academy of Science, USA, 2004, 100, 15241–15246.)
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