脊柱的3个自然弯曲有利于身体平衡，其中腰椎前凸正常形成的时间是（　　）。 -题库考试答案搜索网

脊柱的3个自然弯曲有利于身体平衡，其中腰椎前凸正常形成的时间是（　　）。

单选题

2022-01-10 04:25

A、新生儿
B、3个月能抬头时
C、6个月会坐时
D、1岁能行走时
E、6～7岁

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正确答案

D

试题解析

脊柱的增长反映脊椎骨的发育。出生后第1年脊柱增长快于四肢，1岁以后则落后于下肢增长。新生儿时脊柱仅轻微后凸，3个月左右随抬头动作的发育出现颈椎前凸，此为脊柱第1个弯曲；6个月后会坐时出现胸椎后凸，为脊柱第2个弯曲；1岁左右开始行走时出现腰椎前凸，为脊柱第3个弯曲。

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