胎膜(fetal membranes)又称胎外膜、驻外膜,是羊膜动物(爬行类、鸟类、哺乳类)个体发育过程中胚胎本体(胚体)以外的膜层结构,包括卵黄囊尿囊羊膜、浆膜或绒毛膜四种膜,它们由胚泡分化而来的衍生物,属于一种胚外组织。胎膜对胎儿生长发育具有营养、保护、物质交换等重要功能。

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