From Egg to Embryo
First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst. Inside the uterus, the blastocyst implants in the wall of the uterus, where it develops into an embryo attached to a placenta and surrounded by fluid-filled membranes.
What are the 4 stages of embryonic development?
The Stages of Embryo Development
- Fertilization. Fertilization is the union of the female gamete (egg) and the male gamete (spermatozoa). ...
- Blastocyst Development. ...
- Blastocyst Implantation. ...
- Embryo Development. ...
- Fetal Development.
How long before a zygote becomes an embryo?
How long does it take a zygote to become an embryo? It takes about five to six days for a zygote to transform into a blastocyst (a microscopic ball of cells) and then into an embryo. Within hours after sperm meets egg, the zygote divides and then continues to divide (and divide).
