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Reproductive Science - Clinical Embryology images of human preimplantation embryos - 4-cell embryo
This image of a four-cell human preimplantation was taken on Day 2 of development during routine IVF treatment. You can see that this embryo originated from conventional IVF treatment, as there are several sperm cells on the outer shell, wich is called a zona pellucida. These sperm did not achieve fertilisation as the oocyte only let in one sperm before putting up a "block" to prevent further entry.
A good quality four-cell embryo has equal sized cells (known as blastomeres). These form a tetrahedral shape.
During the first three days of preimplantation embryo development, the blastomeres are distinct cells and can easlly be counted and graded by a clinical embryologist.
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| Contributed by: | Pathology Portal |
| Authored by: |
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| Licence: | © All rights reserved More information on licences |
| Last updated: | 12 July 2023 |
| First contributed: | 15 April 2023 |
| Audience access level: | Full user |
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