SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Nine week old foetus. Coloured ultrasound scan of a nine week old foetus (centre) in the womb. It is floating in its amniotic sac (black). The foetus' crown-rump length (as shown by the dotted line) is 26 millimetres. At nine weeks the webbing between the fingers and toes has disappeared and the heart's four chambers are formed. 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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