DR NAJEEB LAYYOUS / SCIENCE PHOTO LIBRARY DR NAJEEB LAYYOUS / SCIENCE PHOTO LIBRARY
Foetus. Coloured 3-D ultrasound scan of a foetus. It has a hole at the top of its skull because the plates are still forming. The skull plates will not become fully joined at the top until two years after birth. 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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