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Embryo transfer is a step in assisted reproduction in which embryos are placed into the uterus of a female to establish a pregnancy. Learn about the different stages, techniques, and outcomes of embryo transfer, as well as the factors that affect its success.
Learn about the processes of fertilization, cleavage, blastulation, gastrulation, neurulation and organogenesis that occur during the first eight weeks of human embryogenesis. See diagrams, images and references of the stages of human embryo formation.
Learn about the origins and developments of IVF, from the first birth in a nonhuman mammal in 1959 to the first human baby in 1978. Find out who was the first human conceived using IVF and how the technique evolved over time.
Learn about the stages of human embryonic and fetal development from fertilization to birth, with a table of gestational and embryonic ages. See illustrations of the changes in size, shape, and organs of the embryo and fetus at different weeks.
A blastocyst is a structure formed in the early embryonic development of mammals, with an inner cell mass and an outer layer of trophectoderm. Learn how the blastocyst is formed from the morula, how it implants into the uterine wall, and how it is used in IVF and stem cell therapies.
The timeline of reciprocal IVF depends on if a couple chooses to undergo a fresh or a frozen transfer: A fresh embryo transfer IVF cycle lasts around 17–20 days and 10 days after the embryo is transferred to wait for the results of a pregnancy test. [14] A frozen embryo transfer first involves one of the cycles dedicated to the genetic mother.
Carnegie stages are a standardized system of 23 stages used to provide a unified developmental chronology of the vertebrate embryo. The stages are delineated through the development of structures, not by size or the number of days of development, and so the chronology can vary between species, and to a certain extent between embryos.
Implantation is the stage in mammalian embryonic development when the blastocyst attaches to the uterine wall. In humans, implantation occurs around days 5–9 after fertilization, and involves five stages: migration and hatching, pre-contact, attachment, adhesion, and invasion.
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