Image GalleryThree-Week Embryo |
![Three-Week Embryo [Click for next image]](http://media.ehd.org/images/prenatal_numbered_491/three-week-embryo-2.jpg "Click for next image")
| Buy NowFrom The Biology of Prenatal Development. |
Note:The brain emerges about 2½ weeks following fertilization. By three weeks, the major sections of the brain are identifiable.Label Key:
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| All ages referenced to fertilization, not last menstrual period. |
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Three-Week Embryo
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Left Lateral View: 3-Week Embryo
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Three-Week Embryo
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3-Week Embryo
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The Folding of the Embryo
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The 4-Week Embryo
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