【单选题】【消耗次数：1】
大脑后动脉起自（ ）。
①
颈内动脉
②
基底动脉
③
椎动脉
④
大脑前动脉
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相关题目
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大脑动脉环的动脉组成为
①
两侧大脑前动脉、两侧颈内动脉、两侧大脑后动脉、前交通动脉、后交通动脉
②
两侧大脑前动脉、两侧大脑中动脉、两侧大脑后动脉、前交通动脉、后交通动脉
③
两侧大脑前动脉、两侧椎动脉、两侧大脑后动脉、前交通动脉、后交通动脉
④
两侧大脑前动脉、两侧颈内动脉、两侧基底动脉、前交通动脉、后交通动脉
⑤
两侧大脑前动脉、两侧颈内动脉、两侧大脑中动脉、前交通动脉、后交通动脉
【单选题】
脑的血液供应主要包括颈内动脉系统和椎-基地动脉系统两部分，颈内动脉系统主要供应眼部和大脑半球前3/5部分的血液，其中不供应哪部分的血液（）
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额叶
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颞叶
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顶叶
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基底节
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脑干
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_____ that my head had cleared, my brain was also beginning to work much better.
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