Objective: To provide sectional and imaging data for the precise judgement of developmental malformation of fetal brain on sagittal MRI.

目的：为给MR矢状图像精确定位宫内胎儿脑发育畸形及胎儿优生优育的MRI筛查提供断层解剖学依据。

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Therefore, the dwarf mutation in X. helleri is caused by the developmental defect in spinal column, and the vertebral malformation underlies the body type alteration anatomically.

因而推测，剑尾鱼的侏儒突变是由于脊椎的发育缺陷所致，椎体异常是其体型变化的结构基础。

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