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?

• 1.1 Fertilization.
• 1.2 Cleavage.
• 1.3 Blastulation.
• 1.4 Implantation.
• 1.5 Embryonic disc.

What are the 6 stages of embryonic development?

• F. Fertilization- 12-24 hours after implantation.
• C. Cleavage- a series of mitotic cell division convert zygote into multicellular embryo.
• M. Morula- cells become a solid ball.
• B. Blastula- fluid filled cluster of cells, inner cell mast develops.
• G. Gastruela- 3 primary germ layers form.
• N.