File:Human carnegie stage 3 label.jpg

Human Embryo Carnegie stage 3

Human Blastocyst "hatching" from zona pellucida, in early Embryonic Development designated as Carnegie stage 3.

The zona pellucida is shown to the left of the image and the blastocyst is to the right of image.

Note:

• Centre of image - the small opening in the zona pellucida through which the blastocyst is hatching.
• Right of image - the flattened trophoblast cells forming the outer cell layer of the blastocyst
• the inner cell mass shown in the centre of the image and on the left-hand wall of the blastocyst
• the blastocoel forming a large fluid-filled space within the blastocyst

Links: unlabeled image | labeled image | Carnegie stage 3 | Blastocyst Development | Week 1

Original image name: Figure 1 part b, Development of a blastomere-biopsied embryo into a hatching blastocyst. http://www.nature.com/nature/journal/v444/n7118/fig_tab/nature05142_F1.html (image extracted from full figure, adjusted in size and contrast and labels added)

Reference

<pubmed>16929302</pubmed>| Nature

Adapted by permission from Macmillan Publishers Ltd (copyright 2006)