脊髓前动脉大多由哪支动脉发出A．椎动脉B．基底动脉C．小脑后下动脉D．小脑上动脉E．大脑后动脉

作者: rantiku 人气: - 评论: 0

问题脊髓前动脉大多由哪支动脉发出

选项 A．椎动脉 B．基底动脉 C．小脑后下动脉 D．小脑上动脉 E．大脑后动脉

答案 A

解析：两侧椎动脉在进入硬脑膜后分别发出脊髓前动脉，向内下走行，通常在中线吻合成单干，沿脊髓前正中裂下降。

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