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Reproductive Science - Clinical Embryology images of human preimplantation embryos - blastocyst starting to hatch
Expanded human blastocyst at 116hours post insemination.
The inner cell mass can be seen between the 12o'clock and1o'clock position. This will develop into the foetus.
The trophectoderm has started to hatch out of the zona pellucida at the 9 o'clock position. This is where a break, known as a breach in the zona, has taken place. The embryo will continue to expand out of this breach, until it is full hatched. This should take place over the next few hours.
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| Contributed by: | Pathology Portal |
| Authored by: |
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| Licence: | © All rights reserved More information on licences |
| First contributed: | 30 December 2024 |
| Audience access level: | General user |
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