Carnegie stage 1: Difference between revisions

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Embryology - 16 Apr 2024 Expand to Translate
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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

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

Electron Micrographs

Human pronuclei EM PMID 6008199
Human pronuclei EM PMID 6008199
Mitochondria
Human pronuclei
Human pronuclei
Human pronuclei
Human pronuclei
Human pronuclei
Human pronuclei
Human pronuclei
Human pronuclei
Human pronuclei
Human pronuclei
Human pronuclei
Human pronuclei
Human pronuclei
Human pronuclei
Spermatozoon Components
Golgi complex
First Polar Body
First Polar Body
First Polar Body
Second Polar Body
Second Polar Body

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 16) Embryology Carnegie stage 1. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_1

What Links Here?

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 ==Introduction==
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-:'''Links:''' [[Week 1]] | [[Zygote]] | [[Zona pellucida|Zona pellucida]] | [[Cell Division - Mitosis|Mitosis]] | [[Molecular_Development_-_Genetics|Genetics]] | [[Molecular_Development_-_Genetics#Human_Genome|Human Genome]] | [[Molecular_Development_-_Genetics#Mitochondrial_Genome|Mitochondrial Genome]] | [[Lecture - Week 1 and 2 Development|Lecture]] | [[BGDA_Practical_-_Fertilization_to_Implantation|Medicine Practical]] | [[2011_Lab_2|Science Practical]] | [[Carnegie_stage_2|Stage 2]]
+:'''Links:''' [[Week 1]] | [[Zygote]] | [[Zona pellucida|Zona pellucida]] | [[Cell Division - Mitosis|Mitosis]] | [[Molecular_Development_-_Genetics|Genetics]] | [[Molecular_Development_-_Genetics#Human_Genome|Human Genome]] | [[Molecular_Development_-_Genetics#Mitochondrial_Genome|Mitochondrial Genome]] | [[Lecture - Week 1 and 2 Development|Lecture]] | [[BGDA_Practical_-_Fertilization_to_Implantation|Medicine Practical]] | [[ANAT2341_Lab_2|Science Practical]] | [[Carnegie_stage_2|Stage 2]]
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 [[Category:Human Embryo]] [[Category:Carnegie Stage]] [[Category:Carnegie Stage 1]] [[Category:Week 1]]