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Embryo Stages Animations Review Questions |
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- Length 0.4 mm
- The appearance of the notochordal process immediately rostral to the primitive node and streak is used as criterion for stage seven.
- The dorsal surface of the disc is generally slightly convex. It varies in shape from oval to pyriform but may be almost circular.
- The villi, which may reach a length of .5 or even 1 mm, are either present on the entire surface of the chorion or are absent superficially.
- Ovulation age: 15 - 17 days
Question: What is the main characteristic of a stage 7 embryo?
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Developmental Stages in Human Embryos by Ronan O'Rahilly and Fabiola Müller. Published by Carnegie Institution of Washington, Publication 637. 1987. |
Stage 6
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Stage 8
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