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==Early Zygote==
==Early Zygote==


This is described as an early human zygote due to the presence of pronuclei in the centre of the cytoplasm.
This is described as an early human zygote due to the presence of the 2 pronuclei (male and female) in the centre of the cytoplasm.


The haploid '''pronuclei''' of the male (spermatozoa) and female (oocyte) have not yet combined to form a single nucleus.
The haploid '''pronuclei''' of the male (spermatozoa) and female (oocyte) have not yet combined to form a single nucleus.
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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 '''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.
The '''zona pellucida''' forms the thick clear layer that surrounds the cell. This specialised extracellular matrix has nay roles in early development.


At this stage ''in vivo'':
At this stage ''in vivo'':
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:'''Links:''' [[Carnegie stage 1]] | [[:File:Early zygote.jpg|Image - Early zygote]] | [[:File:Early zygote labelled.jpg|Image - Early zygote labelled]]


{{Zygote image links}}


 
===About Carnegie Stage 1===
===About Carnegie Stages 1===


Facts: Week 1, size 0.1 - 0.15 mm (100 - 150 microns)
Facts: Week 1, size 0.1 - 0.15 mm (100 - 150 microns)
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Image Source: UNSW Embryology http://embryology.med.unsw.edu.au/wwwhuman/Stages/Stage1.htm
{{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]]

Revision as of 11:57, 13 May 2014

Early Zygote

This is described as an early human zygote due to the presence of the 2 pronuclei (male and female) in the centre of the cytoplasm.

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. This specialised extracellular matrix has nay roles in early development.

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 Image Links: Image - Early zygote | Image - Early zygote labelled | Image - zygote 1 | Image - zygote 2 | Image - zygote 3 | Image - zygote 2 labeled | Fertilization | Zygote | Carnegie stage 1 | Category:Zygote

About Carnegie Stage 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, March 28) Embryology Early zygote labelled.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Early_zygote_labelled.jpg

What Links Here?
© 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/TimeThumbnailDimensionsUserComment
current12:47, 10 March 2012Thumbnail for version as of 12:47, 10 March 2012500 × 441 (29 KB)Z8600021 (talk | contribs)increase image size
14:28, 20 July 2010Thumbnail for version as of 14:28, 20 July 2010216 × 191 (8 KB)S8600021 (talk | contribs)==Early Zygote (labelled)== About Carnegie Stages 1 Facts: Week 1, size 0.1-0.15 mm Features: zygote, fertilized oocyte, pronuclei, polar bodies, zona pellucida Related Images: Early zygote | Image Source: UNSW Embryology ht