Difference between revisions of "Carnegie stage 1"

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'''Features:''' [[Z#zygote|zygote]], fertilized oocyte, [[P#pronucleus|pronuclei]], [[P#polar bodies|polar bodies]], [[Z#zona pellucida|zona pellucida]]
 
'''Features:''' [[Z#zygote|zygote]], fertilized oocyte, [[P#pronucleus|pronuclei]], [[P#polar bodies|polar bodies]], [[Z#zona pellucida|zona pellucida]]
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:'''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]]
  
:'''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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{{Carnegie stages}}
 
{{Carnegie stages}}

Revision as of 16:27, 23 August 2014

Embryology - 9 Aug 2020    Facebook link Pinterest link Twitter link  Expand to Translate  
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A personal message from Dr Mark Hill (May 2020)  
Mark Hill.jpg
I have decided to take early retirement in September 2020. During the many years online I have received wonderful feedback from many readers, researchers and students interested in human embryology. I especially thank my research collaborators and contributors to the site. The good news is Embryology will remain online and I will continue my association with UNSW Australia. I look forward to updating and including the many exciting new discoveries in Embryology!

Introduction

Early zygote labelled.jpg

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

Links: Week 1 | Oocyte | Spermatozoa | Zygote | Zona pellucida | Mitosis | Genetics | Human Genome | Mitochondrial Genome | Lecture | Medicine Practical | Science Practical | Stage 2


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

Electron Micrographs

Movies

Human fertilization 1 icon.jpg
 ‎‎Fertilisation to
4 Blastomere
Page | Play
Human fertilization 2 icon.jpg
 ‎‎Fertilization
Page | Play

Other Species

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. (2020, August 9) 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