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Twins, 3-D ultrasound scan

Twins, 3-D ultrasound scan

P680/0647

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Credit

DR NAJEEB LAYYOUS / SCIENCE PHOTO LIBRARY DR NAJEEB LAYYOUS / SCIENCE PHOTO LIBRARY

Caption

Twin foetuses. Coloured 3-D ultrasound scan of twin foetuses. Non-identical (dizygotic) twins develop when two separate eggs are released from the ovaries and are fertilized simultaneously. Identical (monozygotic) twins occur when two cells formed by the first division of a fertilized 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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