File:Early zygote labelled.jpg

From Embryology

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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.

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: Zygote | Carnegie stage 1 | Image - Early zygote | Image - Early zygote labelled | Fertilization

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



Image Source: UNSW Embryology http://embryology.med.unsw.edu.au/wwwhuman/Stages/Stage1.htm

File history

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Date/TimeThumbnailDimensionsUserComment
current11:47, 10 March 2012Thumbnail for version as of 11:47, 10 March 2012500 × 441 (29 KB)Z8600021 (talk | contribs)increase image size
13:28, 20 July 2010Thumbnail for version as of 13:28, 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

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