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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.
1 day ago · This page shows some key events of human development during the embryonic period of the first eight weeks (weeks 1 - 8) following fertilization. This period is also considered the organogenic period, when most organs within the embryo have begun to form.
Jun 3, 2022 · Learn how your baby grows and develops during the first three months of pregnancy, from conception to 12 weeks. See weekly milestones, measurements and photos of fetal development.
- It might seem strange, but you're not actually pregnant the first week or two of the time allotted to your pregnancy. Yes, you read that correctly!...
- The sperm and egg unite in one of your fallopian tubes to form a one-celled entity called a zygote. If more than one egg is released and fertilized...
- The rapidly dividing ball of cells — now known as a blastocyst — has begun to burrow into the uterine lining (endometrium). This process is called...
- The fifth week of pregnancy, or the third week after conception, the levels of HCG hormone produced by the blastocyst quickly increase. This signal...
- Growth is rapid this week. Just four weeks after conception, the neural tube along your baby's back is closing. The baby's brain and spinal cord wi...
- Seven weeks into your pregnancy, or five weeks after conception, your baby's brain and face are growing. Depressions that will give rise to nostril...
- Eight weeks into your pregnancy, or six weeks after conception, your baby's lower limb buds take on the shape of paddles. Fingers have begun to for...
- In the ninth week of pregnancy, or seven weeks after conception, your baby's arms grow and elbows appear. Toes are visible and eyelids form. Your b...
- By the 10th week of pregnancy, or eight weeks after conception, your baby's head has become more round.Your baby can now bend his or her elbows. To...
- At the beginning of the 11th week of pregnancy, or the ninth week after conception, your baby's head still makes up about half of its length. Howev...
Learn about the stages of embryonic development from fertilization to implantation, and the formation of the embryonic membranes, placenta, and organ systems. Explore the time-lapse movie of a conceptus and the hormonal changes during pregnancy.
- Lindsay M. Biga, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Mat...
- 2019
Embryogenesis, the first eight weeks of development after fertilization, is an incredibly complicated process. It’s amazing that in eight weeks we’re transforming from a single cell to an organism with a multi-level body plan.
Jul 30, 2022 · A developing human is referred to as an embryo during weeks 3–8, and a fetus from the ninth week of gestation until birth. In this section, we’ll cover the pre-embryonic and embryonic stages of development, which are characterized by cell division, migration, and differentiation.
Learn about the stages of embryonic development during human pregnancy, from zygote to fetus. Test your understanding with questions and answers on key terms and features of the fetus at different weeks.
