椎体中心的初级骨化中心，影像清楚，外形各异。
The primary ossification centers of the vertebral body could found clearly with a variform.
目的观察胎儿面颅骨初级骨化中心出现的时间顺序。
Objective To observe the occurring time of the primary ossification center of the fetus' cranium viscerale.
目的观察胎儿面颅骨初级骨化中心出现的时间顺序。
Objective To observe the occurring time of the primary ossification center of the fetus' cranium viscerale.
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