DR NAJEEB LAYYOUS / SCIENCE PHOTO LIBRARY DR NAJEEB LAYYOUS / SCIENCE PHOTO LIBRARY
Foetus' back. Coloured 3-D ultrasound scan of a foetus' back. The foetus' head is off-screen at top right. The outline of the ribs can be seen under the foetus' skin. Ultrasound scanning uses high-frequency sound waves to create an image of an internal structure. Foetal ultrasound scanning is routine during pregnancy.
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