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胎芽和头臀长什么区别
更新时间: 2020-11-08 00:00:00  

胎芽是受精卵形成的胎囊,没有数据来描述头臀直径,头臀长是用来描述胎儿头到臀部的距离的指标。胎芽是受精卵形成的胎囊,没有数据来描述头臀直径,而且早期没有计算双顶径的方法,胚胎芽在怀孕两个月内,当胎儿的胚胎形态未形成时,超声显示的孕囊内低回声结构将在未来形成胎儿。头臀长是胎儿胚胎形成时从胎儿头到胎儿臀的距离,表明头骨和脊柱的发育,不同的孕期有不同的价值。

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