Evidence that neural mechanisms do not have important effects on cerebral blood flow.

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Abstract
Studies which measured flow with microspheres [in mammals] showed no effect of sympathetic nerves on cerebral blood flow except during extreme hypertension. It is also unlikely that the chemoreceptor or baroreceptor reflexes have an important effect on flow. The possibility is discussed that nerves affect cerebral vessels without altering blood flow significantly. Several experimental approaches are suggested which might resolve this question.