Twin foetuses, ultrasound

Twin foetuses, ultrasound

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Caption: Twin foetuses. Ultrasound scan of twin foetuses aged around 20 weeks. Their heads are at centre left and right. Non-identical (dizygotic) twins develop when two separate eggs are released from 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.

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Keywords: 20-weeks-old, 5-months, anatomy, babies, baby, black-and-white, developing, diagnosis, diagnostics, fetus, foetal development, foetus, foetuses, healthcare, human, human body, image, medical, medicine, obstetrics, pregnancy, pregnant, reproduction, sonography, sound waves, twins, ultrasound scan

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