Embryo brain at four weeks
At four weeks the embryo's brain can be differentiated into the proscephalon, mesencephalon, and rhombencephalon. A white circle represents the area of the optical vesicle.
This is a drawing of an embryo brain at four weeks that shows how it differentiated. The embryo's brain is differentiated into the proscephalon, mesencephalon, and rhombencephalon. A white circle represents the area of the optical vesicle.
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"4 week embryo brain."
http://en.wikipedia.org/wiki/File:4_week_embryo_brain.jpg
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