结构高低级

大体解剖 > 骨, 骨骼系统 > 中轴骨骼 > 脊柱 > Curvaturae secundariae

下层结构


翻译

描述

The cervical and lumbar curves are compensatory or secondary curvatures, and are developed after birth, the former when the child is able to hold up its head (at three or four months), and to sit upright (at nine months), the latter at twelve or eighteen months, when the child begins to walk.


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