Slideshow: The Developing Brain
Three-Week Embryo
#367, Slide 2 of 21
3 weeks
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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. |
