Fertilised bird egg, illustration

Numéro d’image : 12553646
Fertilised bird egg, illustration
Fertilised bird egg, cutaway illustration. This egg (from a chicken) has a yolk (yellow) and egg white (albumen), enclosed in an egg shell (white). The egg shell and white are found in reptile eggs as well, but are absent or different in mammals. The developing embryo (microscopic in size here) is surrounded by an amniotic sac and amniotic fluid, encased in a membrane called the amnion. The embryo is nourished by the yolk, contained in its yolk sac. The egg includes structures to exchange gases and handle liquid waste. Surrounding the yolk is another membrane, the chorion. For a bird egg with a developing foetus, see image C040/3985.
Licence : Droits gérés
Crédit: Science Photo Library / Lunau, Claus
Taille de l’image : 3951 px × 4429 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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