"It's the first detailed map of the human brain across gestation ... The next step is to collect detailed brain images from 10 to 20 women and data from a much larger sample at particular ...

took 10 years and involved hundreds of researchers worldwide. Scientists had mapped the 300-neuron brain of a tiny worm, but this is "the first time we've had a complete map of any complex brain ...

In the 1970s, scientists from several countries proposed to reconstruct, one by one, all the neurons in the brain as they appear under an electron microscope. They started with a small worm.