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trilaminar germ disc
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trilaminar germ disc
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trilaminar germ disc
三胚层胚盘
由内胚层、中胚层、外胚层三个胚层构成的头端较宽、尾端较窄的椭圆形盘状结构。它是人体发生的原基,构成人体的各种细胞、组织和器官均来源于此。
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