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胎盘少于多少是低置
更新时间: 2020-11-05 00:00:00  

通常在孕28周后,如果胎盘的最低点距离宫颈口小于7cm,那么可能就是胎盘低置。

胎盘(placenta)是后兽类和真兽类哺乳动物妊娠期间由胚胎的胚膜和母体子宫内膜联合长成的母子间交换物质的过渡性器官。胎儿在子宫中发育,依靠胎盘从母体取得营养,而双方保持相当的独立性。胎盘还产生多种维持妊娠的激素,是一个重要的内分泌器官。有些爬行类和鱼类也以胎生方式繁殖后代,胚胎生长出一些辅助结构如卵黄囊、鳃丝等与母体组织紧密结合,以达到母子间物质的交换,这样的结构称假胎盘。产妇分娩后的胎盘还是一味中药,称之为人胎衣、紫河车。

关键词: 胎盘 少于 多少

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