part of part_of membranous layer 膜层 extraembryonic structure 胚外结构 conceptus 孕体 organ component layer 器官组件层 extraembryonic membrane 胚外膜 EHDAA2 is a mereological sum. EHDAA2:0004714 FMA:305915 Intrinsic membrane that arises from embryonic germ layers and grow to surround the developing embryo. UBERON:0005631 stuctures homologous to the four extraembryonic membranes appear in mammals [ISBN10:0073040584 (Vertebrates, Kardong)] uberon EHDAA2是一个计量求和。 与4种外胚膜同源的结构出现在哺乳动物中 [ISBN10:0073040584 (Vertebrates, Kardong)] 由胚胎胚层产生的内源性膜，并生长于发育中的胚胎周围。 entire extraembryonic component 整个胚外组分