Nitric oxide plays a crucial role in transmitting information from nonadrenergic, noncholinergic vasodilator nerve to cerebroarterial smooth muscle. Since nitric oxide acts as transmitter, the nerve is termed "nitroxidergic." Mesenteric and temporal arterial tone appears to be regulated by reciprocal nitroxidergic and noradrenergic innervation.
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Toda et al. (1992) studied this question.