Carnegie stage 1: Difference between revisions
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==Introduction== | ==Introduction== | ||
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Human early zygote showing male and female pronuclei | Human early zygote showing male and female pronuclei | ||
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File:Early_zygote_labelled.jpg|Early zygote | File:Early_zygote.jpg|Early zygote | ||
File:Early_zygote_labelled.jpg|Early zygote labeled | |||
File:Stage1 size with ruler.jpg|Stage 1 size with ruler | File:Stage1 size with ruler.jpg|Stage 1 size with ruler | ||
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_01.jpg|Human zygote two pronuclei<ref name="PMID20579351"><pubmed>20579351</pubmed>| [http://www.rbej.com/content/8/1/77 Reprod Biol Endocrinol.]</ref> |
Revision as of 08:15, 25 October 2011
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
Human zygote two pronuclei[1]
Human zygote two pronuclei[1]
Human zygote two pronuclei[1]
Human zygote two pronuclei (labelled)[1]
Human oocyte to blastocyst[2]
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, March 29) 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