题目内容

关于脊髓血供的描述,正确的是

A. 分段供应,各段之间独立供血,不吻合
B. 相对而言,骶尾段血供最差,容易缺血
C. 相对而言,胸4和腰1位置血供吻合最差,容易缺血
D. 脊髓血供来源是脊髓前后动脉相互吻合构成的
E. 脊髓的血供来自椎动脉

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