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The umbilical cord transports blood with wastes to the placenta wall and brings back blood with nutrients to the embryo

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The placenta is a flattened circular organ in the uterus of pregnant mammals that nourishes and maintains the fetus through the umbilical cord. this cord is the main link from the fetus to the placenta. Through it, the placenta provides oxygen and nutrients to the growing baby and removes waste products.

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The allantois the fetal membrane lying below the chorion in many vertebrates, formed as an outgrowth of the embryos gut. in birds and reptiles it grows to surround the embryo; in eutherian mammals it forms part of the placenta

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is early embryogenisis of most eutherian mammals, the inner cell mass (abbreviated ICM and also known as the embryo-blast  in mammals or pluriblast) is the mass of cells inside the primordial embryo that, once fertlized, will eventually give rise to the definitive structures of the fetus

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is the organization of cells into body plan

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The normal process by which a less specialized cell develops or matures to become more distinct in form and function

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The act of setting in firmly in embryology, implantation refers to the attachment of the fertilized egg to the uterine lining, which occurs approximately 6 or 7 days after conception (fertilization). many medical devices or materials may be implanted (embedded).

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The blastocyst is a mammal blastula in which some differentiation of cells has occurred.

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A spherical mass of blastomeres that forms following the splitting of a zygote; it becomes the blastula.

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A division or separation of form. (2) (cell biology) The act or state splitting or dividing a cell., particularly during the telophase of (animal) cell division. (3) (embryology) the repeated division of a fertilized ovum, producing a cluster of cells with the same sizes the original zygote.

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Embryogenesis is the process by which the embryoforms and develops.

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Extra-embryonic membrane is any of the tissues, derived from the fertilized egg, that enclose or otherwise contribute to the support of the developing embryo, as the yolk sac, allantois, amnion, and chorion.

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Gastrulation is a phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a multilayered structure known as the gastrula

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A germ layer is a group of cells in an embryo that interact with each other as the embryo develops and contribute to the formation of all organs and tissues.

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The yolk sac is a membranous sac attached to an embryo. provides nourishment to the embryo

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the middle layer of an embryo in early development

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the outermost membrane surrounding an embryo

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a diploid cell resulting from the fusion of two haploid gametes; a fertilized ovum

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the innermost layer of cells or tissue of an embryo in early development

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the outermost layer of cells or tissue of an embryo in early development

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the innermost membrane that encloses the embryo of a mammal

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Human chorionic gonadotropin, produced by placenta after implantation