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Reproductive Science - Clinical Embryology - image of human preimplantation blastocyst at 115 hours post insemination
Expanded human blastocyst at 115hours post insemination.
The inner cell mass can be seen at the 3 o'clock position. This will develop into the foetus.
Thetrophectoderm can be seen as flattened cells immediately under the zona pellucida. This blasocyst is currently "intrazonal" (confined inside the zona).
The zona thins asthe blastocoel cavity expands until eventually there is a break, known as a breach in the zona.The embryo then expands out of the zona - a process called hatching.
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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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