J. CROYLE / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY J. CROYLE / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Foetal twins. Coloured ultrasound scan of the pregnant womb of a woman, showing twins. At centre (yellow, red) can be seen the body profiles of two foetuses. Each is contained in its own amniotic cavity (black). The scan was taken past the first trimester (three months) of pregnancy. Twins are a natural occurrence in 1 in 80 pregnancies. They may be identical, arising from a single ovum (egg) which splits after fertilisation; non-identical or fraternal twins result from two different eggs being fertilised. Ultrasound uses high-frequency sound waves to produce images of internal regions of the body.
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