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羊膜动物（爬行类、鸟类、哺乳类）在胚胎发育过程中所形成的胚体以外的临时性辅助器官。虽然爬行类、鸟类和卵生哺乳动物的卵中储存有大量卵黄，作为胚胎发育时的养料，卵外还有比较坚韧的壳和膜，使胚胎与变化着的外环境相隔离，免遭机械损伤和干燥，但仍不能保证发育期所必需的全部条件，尚有胎膜在胚胎发育期中起保护、呼吸、吸收养料和排泄废物等作用。胎膜包括羊膜、浆膜（绒毛膜）、尿囊和卵黄囊。这些胎膜虽与胚体相连，但不参与胚体的形成。当胚胎发育完成时，除极少部分胎膜被胚体吸收入内，绝大部分均在孵出或产出时与胚体分离而被遗弃。
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