The protective sac around the embryo or fetus is the amniotic sac.
That sac is called as amniotic sac.
For the first 8 weeks the developing human is called an embryo after that it is called a fetus.
After 8 weeks
After the 8th week, the embryo is called a fetus.
Fetus zygote is not the term to use. A zygote is a fertilized egg. An embryo is a developing baby. A fetus is a baby before it is born.
Fetus zygote is not the term to use. A zygote is a fertilized egg. An embryo is a developing baby. A fetus is a baby before it is born.
In the seventh week of the embryo's development
Fetus
Not capable of living or developing: a nonviable fetus.
zygote, blastocyst, fetus, embryo
Gene combination and their expression in the embryo
The amniotic sac forms during the embryonic stage of development, around week 2 after fertilization. It is a protective membrane filled with amniotic fluid that surrounds and cushions the developing embryo/fetus in the uterus.
Embryo, between the 3rd and 8th week. Fetus, after the 8th week