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【单选题】
有关脑脊液及其循环描述错误的是A.
脑脊液不断由脉络丛等产生，又不断经蛛网膜颗粒回流到血液中，形成脑脊液循环
B.
正常人脑脊液每6～8小时更新一次，分泌脑脊液的速度为每分钟0.3～0.4ml
C.
由侧脑室脉络丛分泌的脑脊液，间流入第三脑室，再经中脑导水管流至第四脑室，继而流入小脑延髓池，并流入蛛网膜下腔，最后经蛛网膜颗粒渗透至上矢状
D.
脑脊液主要由室管膜和脑实质生成
E.
脑的室腔及蛛网膜下腔内充满了无色透明的液体是脑脊液
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举一反三
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