File:Early zygote labelled.jpg

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Early Zygote

This is described as an early human zygote due to the presence of pronuclei 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: Carnegie stage 1 | Image - Early zygote | Image - Early zygote labelled


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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