关于上肢结构特征，不正确的描述是（）。

A.lies between dura matter and arachnoid
B.up to subarachnoid space in the skull by the foramen magnum
C.down the the height of the fifth sacral vertebral
D.terminal cistern is formed by the space below the second sacral vertebral
E.the fluid in it can communicate with that in the center canal of spinal cord directly

A.成人脊髓颈1～4节段与同序数椎体相对应
B.颈5～8和胸1～4节段与同序数椎体上一个相对应
C.胸5～8节段与同序数椎体上两个相对应
D.胸9～12节段与同序数椎体上三个相对应
E.腰1～5节段与第8～10胸椎体相对应

A.起自节段性动脉的脊支
B.腰段来自腰动脉
C.骶尾段来自骶外侧动脉
D.随脊神经穿椎间孔入椎管分为前、后根动脉和脊膜支
E.腰5节段以下供血贫乏