Time-lapse simulation of human embryo development from post-ovulatory day 24 to 56 (Carnegie stages 11 – 23), based on optical photographs of human embryos from the National Museum of Health and Medicine. By Brad Smith at the University of Michigan, School of Art & Design – brdsmith@umich.edu.

Notice how the embryo in the early stages resembles a leech.

See  The Multi-Dimensional Human Embryo and http://www-personal.umich.edu/~brdsmith/

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