Carnegie stage 3: Difference between revisions

Revision as of 17:23, 1 August 2011

Human Blastocyst "hatching" from zona pellucida (classified as Carnegie stage 3).

Blastocyst is too the right of image and zona pellucida is shown to the left of the image.

Note:

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

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

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

Carnegie Stages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | About Stages | Timeline

Cite this page: Hill, M.A. (2024, April 28) Embryology Carnegie stage 3. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_3

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 [[File:Human embryo day 5 label.jpg]] [[File:Human embryo day 5.jpg|Stage 3 Day 5]]
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 * Human blastocyst (day 5) still within zone pellucida.
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