Carnegie stage 1: Difference between revisions
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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]] | [[ANAT2341_Lab_2|Science Practical]] | [[Carnegie_stage_2|Stage 2]] | :'''Links:''' [[Week 1]] | [[Oocyte]] | [[Spermatozoa]] | [[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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Revision as of 14:59, 16 June 2014
Embryology - 26 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
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Carnegie stage 1
Electron Micrographs
Historic Images
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 26) 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