Twin foetuses. Ultrasound scan of twin foetuses at 15 weeks (second 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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Layyous, Dr. Najeeb |
Bildgröße: | 3366 px × 2603 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
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