Web Reference: Learn about the processes of fertilization, cleavage, blastulation, gastrulation, neurulation and organogenesis that occur during the first eight weeks of human development. See diagrams, stages and terms related to human embryology. The embryonic stage lasts from about the third week of pregnancy until the end of the eighth week of pregnancy. The blastocyst begins to take on distinct human characteristics. This page is organised to show a week by week human timeline of development features and approximate timing of key events with more detailed information about specific events in different systems.
YouTube Excerpt: In this video, we take you through the incredible journey of
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