Difference between revisions of "Carnegie stage 1"

From Embryology
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File:Human_zygote_two_pronuclei_01.jpg|Human zygote two pronuclei
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File:Human_zygote_two_pronuclei_01.jpg|Human zygote two pronuclei<ref name="PMID20579351"><pubmed>20579351</pubmed>| [http://www.rbej.com/content/8/1/77 Reprod Biol Endocrinol.]</ref>
File:Human_zygote_two_pronuclei_02.jpg|Human zygote two pronuclei
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File:Stage1 size with ruler.jpg|Stage 1 size with ruler
 
File:Stage1 size with ruler.jpg|Stage 1 size with ruler
 
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==References==
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Revision as of 14:20, 19 July 2010

Early zygote.jpg

Facts: Week 1, size 0.1-0.15 mm

Features: zygote, fertilized oocyte, pronuclei, polar bodies, zona pellucida

The early human zygote where the male and female pronuclei (centre of image) have not yet combined to form the single zygote nucleus. These pronuclei contain all the nuclear DNA (genes) and are the nuclei from the sperm and egg.

Two of the egg's polar bodies (right, 3 o'clock position of image) are shown at the edge of the egg cytoplasm. These polar bodies contain the excess DNA from the meiotic divisions of the egg.

The zona pellucida (edge of image) forms a specialised thick extracellular matrix layer around both the egg and the developing conceptus for the first week.

Links: Science Lecture - Cell Division and Fertilization | Zona pellucida

Additional Images

References

  1. 1.0 1.1 <pubmed>20579351</pubmed>| Reprod Biol Endocrinol.
Carnegie Stages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | About Stages | Timeline

Cite this page: Hill, M.A. (2020, July 11) Embryology Carnegie stage 1. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_1

What Links Here?
© Dr Mark Hill 2020, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G