SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Thirteen week old foetus. Coloured ultrasound scan of a thirteen week old foetus in the womb. Its head is at bottom right, with its torso at centre left. The bones of the spine and ribs are visible. At thirteen weeks the foetus has a crown-rump length of about 7 centimetres. All of the organs are formed, as are the vocal cords. 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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