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Twin foetuses, ultrasound scan

Twin foetuses, ultrasound scan

C003/5073

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Credit

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

Caption

Twin foetuses. Ultrasound scan of twin foetuses (upper centre and left) at 7 weeks (first trimester) of pregnancy. 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 uses high-frequency sound waves to create 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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