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Twin foetuses, ultrasound scan

Twin foetuses, ultrasound scan

P680/0828

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Credit

SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY

Caption

Twin foetuses. Coloured ultrasound scan of twin foetuses at 12 weeks. The foetus' heads are at bottom right, with their bodies extending to centre. Non-identical (dizygotic) twins develop when two separate eggs are released from the ovaries and are fertilised simultaneously. Identical (monozygotic) twins occur when two cells formed by the first division of a fertilised egg develop independently. 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.

Release details

Model release not required. Property release not required.

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