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- In humans, embryo development includes growth before 8th weekWebMD: From Embryo to Baby in 9 Months
- After the 8th week, the developing human is considered a fetusWebMD: From Embryo to Baby in 9 Months
- Embryonic development includes major cell specialization and organ system developmentWebMD: From Embryo to Baby in 9 Months
- Alcohol, drugs and radiation can cause problems with embryonic developmentWebMD: From Embryo to Baby in 9 Months
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An embryo is the early fetal development of complex living organisms. Embryos have similar characteristics across many species.
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Fertilization
Embryonic development begins with the fertilization of the ovum by a single sperm cell. With the fertilization, the two cells merge to create a new cell called a zygote. The zygote begins to divide until, after three or four days it becomes a morula, named so because of its mulberry shape.The Visable Embryo: Homepage -
Implantation
The morula enters the uterus from one of the fallopian tubes and after another day or two the group of cells, now called a blastocyst, will implant itself into the uterine lining. The blastocyst produces human chorionic gonadotropin hormone which starts a hormone chain reaction that prevents menstruation.The Visable Embryo: Homepage -
Cell Differentiation
After the 12th day, the blastocyst begins to differentiate, first into two separate groups, and then further into groups of cells that will develop into organ systems over the next two weeks. The embryo will develop from a small ball of cells into a tadpole-like organism. After the organ systems form, they begin to develop detail, with the heart and the brain dividing into sections and appendages forming visible fingers with webbing. At eight weeks past conception, the embryo is called a fetus.WebMD: From Embryo to Baby in 9 Months The Visable Embryo: Homepage -
Safety
During embryonic development, critical growth is going on. To prevent damage to embryonic cell growth, WebMD suggests maternal refrain from alcohol, drugs and radiation, especially during the early weeks of pregnancy.WebMD: From Embryo to Baby in 9 Months -
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Embryo Questions
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Should Dr. Michael Kamrava be allowed to keep implanting women with multiple embryos? 3 AnswersI see this as a right to privacy issue between a doctor and his/her patient, in the exact same way that abortion was seen as a right to privacy issue in the Roe... read more -
If an IVF doctor implants someone elses embryo in your uterus by mistake, can the biological mother tell you not to abort? 4 AnswersThat is a really tough question. You a have two competing issues here: the right of property of the original owner of the embryo (biological mother) and the ri... read more -
Should new findings on embryo preferences be taken as a new sign of "life at conception" and used to argue against abortion? 4 AnswersDisclaimers are good as they hopefully prevent any knock down drag out hahahaha. This is interesting but, as was actually pointed out to me in a study that I li... read more -
What is the ethical debate over the transplantation of DNA in an embryo? 4 AnswersThis issue is potentially very technical if you don't have a biology background. Everyone knows these days that people have DNA and get some of each from their ... read more
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