Foetus' face. Coloured 3-D ultrasound scan of a foetus' face in profile. The foetus' nose is at centre left, the mouth is below it and an eye to its right. The foetus is holding a fist in front of his mouth. This was taken in the third trimester of pregnancy. 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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