Fetal Development: Week-by-Week Stages of Pregnancy - Cleveland Clinic
2024年3月19日 · There are three stages of fetal development: germinal, embryonic and fetal. Most people don’t talk about their pregnancy in these terms, but it can be helpful to know. Germinal stage. The germinal stage is the shortest stage of fetal development. It begins at conception when a sperm and egg join in your fallopian tube. The sperm fertilizes ...
Fetal development by week: Your baby in the womb - BabyCenter
2023年2月21日 · Follow your baby's development week by week, from conception to labor, in these amazingly detailed, doctor-reviewed images. At the start of this week, you ovulate. Your egg is fertilized 12 to 24 hours later if a sperm penetrates it.
Fetal development: The 1st trimester - Mayo Clinic
2022年6月3日 · Within the blastocyst, the inner group of cells will become the embryo. The outer layer will give rise to part of the placenta, which will nourish your baby throughout the pregnancy. By the end of the fifth week of pregnancy — three weeks after conception — …
Stages of Fetal Development - Stages of Fetal Development
The next stage in development is the embryo, which develops within the amniotic sac, under the lining of the uterus on one side. This stage is characterized by the formation of most internal organs and external body structures.
Human embryonic development - Wikipedia
Human embryonic development or human embryogenesis is the development and formation of the human embryo. It is characterised by the processes of cell division and cellular differentiation of the embryo that occurs during the early stages of development.
Pregnancy stages week by week - BabyCenter
We've got loads of expert-approved info about each week and trimester, including what's up with your growing baby and what changes to expect for yourself. You'll find stunning fetal development videos, thousands of articles, and helpful tools like our …
Embryonic Development - Embryology
Use the stage number links to images and information about each specific stage of human development over the first 8 weeks. The links below give a broad overview of developmental events during each week.
3 Prenatal Development Stages - Verywell Mind
2024年5月20日 · The first stage, known as the germinal stage, involves the formation of the zygote and early cell division. The second stage, called the embryonic stage, involves the early growth of the embryo, including the formation of the neural tube, which will eventually become the brain and spinal cord.
28.2 Embryonic Development – Anatomy & Physiology
Distinguish the stages of embryonic development that occur before implantation; Describe the process of implantation; List and describe four embryonic membranes; Explain gastrulation; Describe how the placenta is formed and identify its functions; Explain how an embryo transforms from a flat disc of cells into a three-dimensional shape ...
Stages of Development of the Fetus - Stages of ... - MSD Manuals
The next stage in development is the embryo, which develops within the amniotic sac, under the lining of the uterus on one side. This stage is characterized by the formation of most internal organs and external body structures.