Nō to shinkei = Brain and nerve
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In cerebral circulation, it is suspected that neurogenic or myogenic mechanism protect blood vessel and blood-brain barrier during sudden increase in arterial pressure. To discriminate metabolic mechanism from neurogenic and myogenic mechanism, complete cerebral venous occlusion model of cat was used to obtain high venous pressure. In twenty-one anesthetized cats, 0.3 ml of cyanoacrylate were injected into anterior part of SSS to occlude SSS and cortical vein. ⋯ Correlation between ICP and arterial diameter is obvious. The dominant mechanism of cerebral blood flow control is metabolic, not neurogenic and myogenic. Increase of ICP, dilatation of vein and dilatation of artery with increasing ICP are consistent with the theory.(ABSTRACT TRUNCATED AT 250 WORDS)