SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Thirteen week old foetus. Coloured 3-D ultrasound scan of a thirteen week old foetus in the womb. Its head is at upper left, with its body extending to bottom right. At this stage all of the foetus' 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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