Embryologist Bernadette de Bakker and colleagues at the Academic Medical Center in Amsterdam created the atlas to help students, doctors and researchers better understand what goes on in those earliest weeks.
“We might know more about the moon than about our own development,” de Bakker says. Even today,
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, human embryology textbooks often rely on pictures of chick or mouse embryos to describe how humans grow. Any human embryonic data used “is often based on just one or two specimens,” she says.
And that’s a problem because,
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, as de Bakker has discovered, not all human embryos are the same.
Her team photographed nearly 15,000 cross sections of human embryos from the Carnegie Collection,
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, a famous set of historical specimens collected from hysterectomies and abnormal pregnancies or miscarriages. De Bakker and colleagues uploaded the photos into a computer program,
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, and then,
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, using digital pencils and drawing pads,
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, traced and labeled every organ and structure in every photo. It took some 75 people roughly 45,
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,000 hours to complete.
What they (and we) have gained is a remarkable look at humans’ first metaphorical steps — the steady developmental march that,
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, eventually, takes an embryo from a bundle of cells to babyhood.

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