LIVING ART ENTERPRISES, LLC / SCIENCE PHOTO LIBRARY LIVING ART ENTERPRISES, LLC / SCIENCE PHOTO LIBRARY
This image of an early foetus (teal) at about 8.5 weeks after conception was obtained from a transvaginal ultrasound exam. You can see the placenta (purple) developing around the foetus. The yolk sac which provides nourishment only at the very beginning of development is yellow. The crown-rump length is measured and provides an estimation of the age of gestation.
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