What happens during the embryo phase?
Starting in the second week after fertilization, the embryo starts to develop distinct cell layers, form the nervous system, make blood cells, and form many organs. By the end of the embryonic stage, most organs have started to form, although they will continue to develop and grow in the next stage (that of the fetus).
What is the process of an embryo?
The blastocyst attaches to the wall of the uterus and gradually implants itself into the uterine lining. During implantation, its cells differentiate further. At day 15 after conception, the cells that will form the embryo become an embryonic disc. Other cells begin to form support structures.
What is the beginning stage of an embryo?
Blastocysts are a ball-like early stage of embryonic development that is formed five days after fertilisation occurs and can go on to form embryos. But their use in science is controversial because of their potential to grow into a living human individual.
What are the four stages of embryonic development?
Briefly, embryonic development have four stages: the morula stage, the blastula stage, the gastrula stage, and the neurula stage. Prior to implantation, the embryo remains in a protein shell, the zona pellucida , and undergoes a series of cell divisions, called mitosis.
When does an embryo become a fetus?
An embryo officially becomes a fetus at the end of the embryonic period, which is the 8th week after conception, the 10th week of pregnancy. After that, the fetal period begins, which is the latter stages of pregnancy.
What is the proper order of embryonic development?
The stages of embryonic development in the correct order; 1. egg fertilized to form a zygote 2. cell division in a zygote to form a morula 3. cell division to form a blastocyst 4. differentiation of cells in the blastocyst 5. development of tissues 6. development of organs