Implantation- Process, Events, Significance

Implantation- Process, Events, Significance The term “implantation” is used to describe the process of attachment and invasion of the uterus endometrium by the blastocyst (conceptus) in placental animals. It begins at the end of the first week and is completed by the end of the second week of gestation. Implantation occurs in the endometrium of the uterus superior in the …

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Blastocyst- Stages, Significance

The preimplantation period of human embryo development is remarkable and characterized by successive changes in terms of genetic control, physiology, and morphology of the embryo. Blastocyst (Greek, blastos= sprout + cystos = cavity) is a distinctive stage of mammalian embryo development, characterized by a hollow cellular mass that forms in early development. It is an embryo that has developed for five to six days after …

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Human Embryogenesis

Human Embryogenesis Human embryogenesis refers to the development and formation of the human embryo. It encompasses the first eight weeks of development after fertilization, in which a single cell formed at fertilization turns into an organism with a multi-level body plan. It is characterized by the process of cell division and cellular differentiation that occurs during the early stages of development. The entire process …

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Epiblast- Development and Significance

Epiblast- Development, and Significance As implantation of the blastocyst occurs, morphologic changes in the embryoblast produce a bilaminar embryonic disc composed of epiblast and hypoblast cells. Epiblast is derived from the inner cell mass and lies above the hypoblast.  The epiblast is thus, one of the two distinct layers arising from the inner cell mass in the mammalian blastocyst. It …

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Morula- Stage, Development, Significance

Within twenty-four hours after fertilization, the zygote initiates a rapid series of mitotic cell divisions called cleavage. These divisions are not accompanied by cell growth, so they subdivide the large zygote into many smaller daughter cells called blastomeres. The first cleavage division divides the zygote to produce two daughter cells. The second division, which is complete at about forty hours …

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