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Three-Week Embryo
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Note:The first hint of central nervous system development (brain and spinal cord) occurs about 18 days after fertilization with the appearance of the neural folds.Label Key:1. midbrain 2. forebrain 3. hindbrain 4. somites | ||
| All ages referenced to fertilization, not last menstrual period. |
Embryo at About 11 Days
Tube Shaped Heart
Three-Week Embryo
Left Lateral View: 3-Week Embryo
Three-Week Embryo
3-Week Embryo
