Babies in the womb have lizard-like hand muscles
"These muscles were lost 250 million years ago," Dr Diogo said.
"No adult mammal, no rat, no dog has those muscles. It's impressive. It was really a long time ago."
"It used to be that we had more understanding of the early development of fishes, frogs, chicken and mice than in our own species but these new techniques allow us to see human development in much greater detail."
Dr Sergio Almécija, an anthropologist who studies ape and human evolution, at the American Museum of Natural History, said the findings provided a deeper appreciation of human development but raised many questions.
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