Carnegie Stages |
Carnegie stages are a series of 23 developmental stages used to describe the human embryonic period, which is the first 8 weeks of development before the term "fetus" is used. The stages are mainly based on external features, rather than size, and take their name from the human embryo collection at the Carnegie Institution of Washington. For more information about the stages, please see our staging criteria. |
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CS9 Images | CS10 Images | CS11 | CS12 | CS13 | ||||
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CS14 | CS15 | CS16 | CS17 | CS18 | ||||
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CS19 | CS20 | CS21 | CS22 | CS23 |