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Abstract
The aim of this study was to determine the effects of electrical stimulation of the dorsal raphe nucleus on local cerebral glucose utilization (LCGU) in the α-chloralose anaesthetized rat. Activation of the dorsal raphe nucleus effected significant increases in LCGU, ranging from 13 to 52% in 8 brain structures out of 33 investigated. Increases were restricted to extrapyramidal and limbic non-specific areas, and no modifications were observed in cortical areas. The comparison with our previous results, showing that a similar raphe activation induced a global decrease in local cerebral blood flow, suggests that the ascending serotonergic system may be of importance in the regulation of the cerebral circulation.
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