Abstract
Bulk cerebrospinal fluid (CSF) production was measured in rabbits by ventriculocisternal perfusion of [ 14C]inulin. Intraventricular or intravenous infusion of carbamylcholine or acetylcholine produced a dose-related reduction in the CSF formation by as much as 55%. The effect was antagonized by atropine but not by hexamethonium. Carbachol potentiated the reduction induced by sympathetic nerve stimulation or noradrenaline to an equal extent. The results show that the bulk CSF production is markedly reduced through cholinergic mechanisms involving the muscarinic type of receptors in the cholinergically innervated choroid plexus.
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