Stages of Embryology
The process by which the sperm and egg fuse to form the zygote is known as fertilization.
- Blastocyst development: Development of the blastocyst involves the division of the zygote into a small group of cells inside a structure known as the blastocyst, which has a trophoblast and an inner cell mass.
- Blastocyst implantation: When a blastocyst attaches itself to the uterine wall, the trophoblast divides into the placenta and the inner cell mass forms the embryonic disc. This process is known as blastocyst implantation.
- Embryo development: The three germ layers (ectoderm, mesoderm, and endoderm) as well as the main organs and systems that emerge from the embryonic disc are formed during the process of embryonic development.
- Fetal development: It is the growth and maturation of fetus until birth.
What is Embryology?
Embryology is the study of the origin and prenatal development of an organism which comprises the germinal, embryonic, and fetal periods. The germinal period consists of the first two weeks from conception, the embryonic period includes the third to eighth week from conception, and the fetal period consists of the ninth week from conception to birth. Gestation in embryology refers to the period from conception to birth. The gestation period is different from gestational age which is measured in weeks starting from the first day of the mother’s last menstrual period.
Table of Content
- What is Embryology?
- What is Embryogenesis?
- Stages of Embryology
- Human Development
- Duration and Stages of Pregnancy
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