问题
单项选择题
关于椎管腔横断面形态的描述，哪项是正确的？（）
A.颈段上部近枕骨大孔处近似圆形
B.胸段大致呈椭圆形
C.腰段中部为三角形
D.骶管呈扁三角形
E.以上都对
答案
参考答案：E
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关于椎管腔横断面形态的描述，哪项是正确的？（）
A.颈段上部近枕骨大孔处近似圆形
B.胸段大致呈椭圆形
C.腰段中部为三角形
D.骶管呈扁三角形
E.以上都对
参考答案：E
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