Template:POTD/2007-03-21
This photo of an opened oviduct with an ectopic pregnancy features a spectacularly well preserved 10-millimeter five-week-old human embryo. It is uncommon to see any embryo at all in an ectopic, and for one to be this well preserved (and undisturbed by the prosector's knife) is quite unusual. Even an embryo this tiny shows very distinct anatomic features, including tail, limb buds, heart (which actually protrudes from the chest), eye cups, cornea/lens, brain, and prominent segmentation into somites.Photo credit: Ed Uthman, M.D.