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Twin foetuses, ultrasound

Twin foetuses, ultrasound

P680/0531

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Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Twin foetuses. Coloured ultrasound scan of twin foetuses (green & yellow) aged around 20 weeks. Their heads are at centre left and right. Non- identical (dizygotic) twins develop when two separate eggs are released from the ovaries and fertilised. Identical (monozygotic) twins occur when the two cells formed by the first division of a fertilised egg develop independently. In ultrasound scanning, high-frequency sound waves are emitted into the body via a transducer. The returning echoes are recorded and used to build an image of internal structures.

Release details

Model release not required. Property release not required.

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