Twin foetuses. Coloured ultrasound scan of twin foetuses (blue & orange) 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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library |
Taille de l’image : | 3500 px × 3000 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |