Embryonic disk refers to the platelike inner part of the blastocyst that differentiates into the ectoderm , mesoderm, and endoderm of the embryo .

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Ectoderm at psychology-glossary.com■■
Ectoderm refers to the outer layer of the embryo , which will become the hair, the outer layer of skin, . . . Read More
Endoderm at psychology-glossary.com■■
Endoderm refers to the inner layer of the embryo which becomes the lungs and the digestive system inner . . . Read More
Mesoderm at psychology-glossary.com■■
Mesoderm is the central layer of the embryo from which the bones and muscles develop; middle layer of . . . Read More
Trophoblast at psychology-glossary.com
Trophoblast refers to the outer part of the blastocyst from which the amniotic sac, placenta, and umbilical . . . Read More