Difference between revisions of "Carnegie stage 1"

From Embryology
Line 48: Line 48:
 
File:Human pronuclear stage EM12.jpg|Human pronuclei
 
File:Human pronuclear stage EM12.jpg|Human pronuclei
 
File:Human pronuclear stage EM13.jpg|Human pronuclei
 
File:Human pronuclear stage EM13.jpg|Human pronuclei
File:Human pronuclear stage EM14.jpg|Human pronuclei
+
File:Human pronuclear stage EM14-16.jpg|Human pronuclei
File:Human pronuclear stage EM15.jpg|Human pronuclei
 
File:Human pronuclear stage EM16.jpg|Human pronuclei
 
 
File:Human pronuclear stage EM17.jpg|Human pronuclei
 
File:Human pronuclear stage EM17.jpg|Human pronuclei
 
File:Human pronuclear stage EM18.jpg|Human pronuclei
 
File:Human pronuclear stage EM18.jpg|Human pronuclei

Revision as of 00:27, 24 February 2012

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 | 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

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 14) 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