P. SAADA / EURELIOS / SCIENCE PHOTO LIBRARY P. SAADA / EURELIOS / SCIENCE PHOTO LIBRARY
Hand of a foetus. Ultrasound scan showing the open hand of a 21 week old foetus. Fingers and thumb are each separate and well differentiated, with developing bone (white) seen in the digits and palm. Bone development and ossification starts at 8 weeks of foetal age. This ultrasound scan was made by Dr Philippe Saada. Saada has refined the technique of ultrasound to obtain high-definition images. Ultrasound scanning uses high-frequency sound waves to examine soft tissues such as a foetus inside the womb or to diagnose organ disease. Ultrasound can show whether foetal development is normal. Photographed at the Ultra- sound Centre of La Marjolaine at Montrouge, Paris.
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