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髮夾形轉彎hairpin turn


這次雙颱之一寶發，在巴士海峽突然急轉直下，在衛星雲圖上出現一個銳角的轉彎，由此後強度大減，成為輕度颱風，甚至消散，這個圖像，讓人想起人體內一條很重要的血管 Adamkiewicz artery，這是中下胸與腰薦椎最重要的營養血管，從腹主動脈分出，成為radicular a. 或者 radiculomedullary a. 其後支進入椎間孔往上延伸，u turn向下與前椎動脈anterior spinal a.會合，形成影像學辨識上的特徵( hairpin sign).因為這樣的急轉彎，這條動脈對於血流與血壓的敏感性異於尋常，就好像這次的寶發颱風一樣，急轉彎後，強度馬上減弱。

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2009年10月14日 星期三 at 凌晨1:09

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