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Embryology of chicken; 24 hours after fertilization

Legend:

1  area opaca 
2  area pelucida
3  neural fold
4  head fold
5  fore gut
6  neural groove
7  somite
8  notochord
9  unsegmented mesoderm
10  Hensen's Node
11  primitive streak

English name: Common chicken
Scientific name: Gallus domesticus
Familia: Phasianidae/Meleagridae
Classis: Aves
Phylum: Chordata (subphylum vertebrata)
Regnum: Animalia