DR NAJEEB LAYYOUS / SCIENCE PHOTO LIBRARY DR NAJEEB LAYYOUS / SCIENCE PHOTO LIBRARY
Foetal heart. Coloured 3-D ultrasound scan of part of a human foetus, showing the heart (dark, upper left) and the descending aorta (down centre). The spine is the knobbly structure from upper right to bottom right. Ultrasound scanning is a diagnostic technique that sends high-frequency sound waves into the body via a transducer. The returning echoes are recorded and used to build an image of an internal structure. Foetal ultrasound scanning is routine during pregnancy.
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