UNSW Embryology

Carnegie Stage 3

© Dr Mark Hill (2008)

Acknowledgements

Carnegie Stages 3

     

About Carnegie stage 3

Facts: Week 1, 4 - 5 days, size 0.1-0.2 mm

Features: zona pellucida, trophoblast shell, inner cell mass, blastoceol

Events

Blastocyst hatches from the zona pellucida shell.

The blastocyst has a trophoblast shell of flattened cells, a blastoceol which is a fluid-filled cavity, an inner cell mass which is a small number of cells attached to the trophoblast wall and protruding into the blastoceol.

Stage 3 Unlabelled | Stage 3 Labelled

Next - Carnegie Stages 7

Stage 7 Unlabelled Stage 7 Labelled

Carnegie Stage images

Image source: Klimanskaya I, Chung Y, Becker S, Lu SJ, Lanza R. Human embryonic stem cell lines derived from single blastomeres. Nature. 2006 Aug 23 Adapted by permission from Macmillan Publishers Ltd (copyright 2006)

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