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Abstract
Vasodilative regulation of the cerebral cortex by intracranial cholinergic nerves originating in the nucleus basalis of Meynert of the basal forebrain and projecting broadly to the cerebral cortex has been demonstrated in rats [see a review by Sato A & Sato Y: Neurosci Res 14: 242, 1992]. Although similar cholinergic projections exist in the cerebral cortex of cats, it has not as yet been determined whether they mediate vasodilation. We have recently showed that when blood pressure changes were prevented by section of the spinal cord at the upper thoracic level, cerebral cortical blood flow response induced by somatosensory stimulation of a forelimb in anesthetized cats was quite different from that reported in rats: vasodilative responses in cats were restricted to the primary somatosensory cortex contralateral to the stimulated forelimb, whereas responses in rats were bilateral and widespread.
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