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==Early Zygote== | ==Early Zygote== | ||
Facts: Week 1, size 0.1-0.15 mm | An early human zygote due to the presence of male and female pronuclei in the centre of the cytoplasm. (see also [[:File:Early zygote labelled.jpg|labelled image]]) | ||
The haploid '''pronuclei''' of the male (spermatozoa) and female (oocyte) have not yet combined to form a single nucleus. | |||
The '''polar bodies''' can be seen at the edge of the cytoplasm (at 3 o'clock position). These exclusion bodies contain the additional oocyte DNA produced in meiosis. | |||
The '''zona pellucida''' forms the thick clear layer that surrounds the cell. | |||
At this stage ''in vivo'': | |||
* there would still be granulosa cells and spermatozoa attached to the zone pellucida. | |||
* the zygote floats freely within the uterine tube. | |||
* The cell is preparing for the first mitotic division. | |||
:[[Zygote|'''Links''']]: [[Carnegie stage 1]] | [[:File:Early zygote.jpg|Image - Early zygote]] | [[:File:Early zygote labelled.jpg|Image - Early zygote labelled]] | [[Fertilization]] | [[Zygote]] | |||
===About Carnegie Stages 1=== | |||
Facts: Week 1, size 0.1 - 0.15 mm (100 - 150 microns) | |||
Features: zygote, fertilized oocyte, pronuclei, polar bodies, zona pellucida | Features: zygote, fertilized oocyte, pronuclei, polar bodies, zona pellucida | ||
{{Footer}} | |||
[[Category:Carnegie Stage]] [[Category:Carnegie Stage 1]] [[Category:Week 1]] [[Category:Zygote]] | [[Category:Carnegie Stage]] [[Category:Carnegie Stage 1]] [[Category:Week 1]] [[Category:Zygote]] |
Latest revision as of 12:15, 20 July 2015
Early Zygote
An early human zygote due to the presence of male and female pronuclei in the centre of the cytoplasm. (see also labelled image)
The haploid pronuclei of the male (spermatozoa) and female (oocyte) have not yet combined to form a single nucleus.
The polar bodies can be seen at the edge of the cytoplasm (at 3 o'clock position). These exclusion bodies contain the additional oocyte DNA produced in meiosis.
The zona pellucida forms the thick clear layer that surrounds the cell.
At this stage in vivo:
- there would still be granulosa cells and spermatozoa attached to the zone pellucida.
- the zygote floats freely within the uterine tube.
- The cell is preparing for the first mitotic division.
- Links: Carnegie stage 1 | Image - Early zygote | Image - Early zygote labelled | Fertilization | Zygote
About Carnegie Stages 1
Facts: Week 1, size 0.1 - 0.15 mm (100 - 150 microns)
Features: zygote, fertilized oocyte, pronuclei, polar bodies, zona pellucida
Cite this page: Hill, M.A. (2024, April 24) Embryology Early zygote.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Early_zygote.jpg
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 11:45, 10 March 2012 | ![]() | 500 × 441 (23 KB) | Z8600021 (talk | contribs) | |
16:40, 27 July 2009 | ![]() | 216 × 191 (4 KB) | MarkHill (talk | contribs) | About Carnegie Stages 1 Facts: Week 1, size 0.1-0.15 mm Features: zygote, fertilized oocyte, pronuclei, polar bodies, zona pellucida Image Source: UNSW Embryology http://embryology.med.unsw.edu.au/wwwhuman/Stages/Stage1.htm |
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