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is the process by which the embryo forms and develops. In mammals, the term refers chiefly to early stages of prenatal development,

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are the layers enclosing the embryo inside the uterus. There are four layers: the amnion, yolk sac, allantois, and chorion. The amnion is the innermost layer, enclosing the embryo in the amnion fluid, which protects it from mechanical stress.

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A flattened circular organ in the uterus of pregnant eutherian mammals, nourishing and maintaining the fetus through the umbilical cord.

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a flexible cordlike structure containing blood vessels and attaching a human or other mammalian fetus to the placenta during gestation.

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the outermost layer of cells or tissue of an embryo in early development, or the parts derived from this, which include the epidermis and nerve tissue.

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

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The chorion is the outermost membrane surrounding an embryo of reptile, bird, or mammal. In mammals (Including humans) It contributes to the formation of the placenta.

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The yolk sac is fluid filled sac that insulates and protects the embryo

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Is the generalization of three layers of cells (ectoderm, Mesoderm, and Endoderm) that are formed in the early embryo.

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The early phase of embroll development.

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The stage of pregnancy at which the already fertilized egg adheres to the wall of the uterus. At this stage of prenatal development, the conceptus is a blastocyst.

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Is the organization of cells into human body

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

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Is the organization of cells into body plan

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

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A division or separation of form. (2) (cell biology) The act or state of splitting or dividing of 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 size of zygote.

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(of an immature or stem cell) capable of giving rise to several different cell types.

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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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is a hormone produced by the placenta after implantation. The presence of hCG is detected in some pregnancy tests

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It does not surround the embryo, and has a yolk sac to help produce blood cells.

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Grows into fluid filled sac that insulates and protects the embryo.