A–Z Glossary

Embryonic period

The embryonic period is the early stage of development before week 9, when the basic body plan and organs are forming.

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Organ development timeline

Organ development timeline

What organ development means in early pregnancy Organ development begins during the embryonic period, when cells move from broad patterning into specialized tissue layers and then into recognizable structures. In standard embryology, organogenesis occurs from weeks 3 to 8 after conception, and this is the period in which the body’s major organ systems are established. […]