What Is the Embryonic Stage

After conception, your baby begins a period of dramatic change known as the embryonic stage. This stage runs from the 5th through the 10th week of pregnancy. During this stage, the baby is called an embryo. … Your baby’s major organs and body parts begin to take shape. The placenta forms during the embryonic stage.

What is the definition of a embryonic stage?

in human prenatal development, the roughly 6-week period in which the three-layered embryo (gastrula) develops. The embryonic stage follows the 2-week germinal stage and precedes the fetal stage, which begins in the 3rd month of pregnancy.

What is a blastocyst?

By the fifth or sixth day, the fertilized egg is known as a blastocyst — a rapidly dividing ball of cells. The inner group of cells will become the embryo. The outer group will become the cells that nourish and protect it.