Carnegie stage 1: Difference between revisions
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File:Human-oocyte_to_blastocyst.jpg|Human oocyte to blastocyst PMID 19924284 | File:Human-oocyte_to_blastocyst.jpg|Human oocyte to blastocyst PMID 19924284 | ||
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File:Human pronuclear stage | File:Human pronuclear stage EM022.jpg|PMID 6008199 | ||
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Revision as of 22:57, 23 February 2012
Introduction
Human early zygote showing male and female pronuclei |
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 are the nuclei from the spermatozoa (sperm) and oocyte (egg) and contain all the nuclear genetic material (chromosomes, DNA, genes). 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. Mitochondria in the cytoplasm contain additional genes and in humans these mitochondrial genes are entirely derived from the oocyte. Facts: Week 1, size 0.1-0.15 mm Features: zygote, fertilized oocyte, pronuclei, polar bodies, zona pellucida
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- 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
Carnegie stage 1
Early zygote
Early zygote labeled
Stage 1 size with ruler
Human zygote two pronuclei PMID 20579351
Human zygote two pronuclei PMID 20579351
Human zygote two pronuclei PMID 20579351
Human zygote two pronuclei (labelled) PMID 20579351
Human oocyte to blastocyst PMID 19924284
PMID 6008199
PMID 6008199
Historic Images
Fig. 15. Diagram of fertilization of the ovum
Fig. 16. Fertilization of the eggs of the star-fish and sea-urchin
References
- 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. (2024, April 19) Embryology Carnegie stage 1. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_1
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
