Anatomy & Physiology › Section Y · Reproduction and development › Topic Y.5
Embryonic and fetal development
In about 38 weeks a single zygote becomes a newborn of trillions of cells. The first eight weeks lay down every organ in miniature; the remaining thirty are mostly growth and maturation, supported throughout by the placenta.
In this topic
- Two ways of counting time
- From zygote to blastocyst
- Implantation and hCG
- Worked example: lining up the two clocks
- The embryonic membranes
- Gastrulation and the three germ layers
- Worked example: tracing tissues to germ layers
- Organogenesis: weeks 3 to 8
- The placenta
- The fetal period: growth and maturation
- Common mistakes to avoid
- Key takeaways
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