Carnegie stage 1: Difference between revisions
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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. | 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. | ||
'''Links:''' [[2009_Lecture_2|Science Lecture - Cell Division and Fertilization]] | [[Zona pellucida|Zona pellucida]] | |||
==Additional Images== | ==Additional Images== | ||
Revision as of 08:32, 5 April 2010
Facts: Week 1, size 0.1-0.15 mm
Features: zygote, fertilized oocyte, pronuclei, polar bodies, zona pellucida
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 contain all the nuclear DNA (genes) and are the nuclei from the sperm and egg.
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.
Links: Science Lecture - Cell Division and Fertilization | Zona pellucida
Additional Images
Stage1 size with ruler
- 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 19) 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
