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9-Week Human Embryo from Ectopic Pregnancy | by euthman
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9-Week Human Embryo from Ectopic Pregnancy

The size (2cm in length) and anatomic features suggest development equivalent to a nine-week pregnancy (or seven weeks post ovulation). In obstetrics, pregnancy is dated from the first day of the last menstrual period, which is about two weeks prior to the ovulation that resulted in the pregnancy

 

There is another image of a 10-week embryo on Flickr, which is quite spectacular.

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Taken circa 2000