Carnegie stage 2: Difference between revisions

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==Introduction==
==Introduction==
[[File:Human-oocyte to blastocyst.jpg|left]]
[[File:Human-oocyte to blastocyst.jpg|left]]
First cell divisions of the zygote forming initially 2 blastomeres and continuing to divide to form the [[M#morula|morula]]. This early mitosis is a unique embryonic cell cycle (M, S, M phases) compared to adult (M, G<sub>1</sub>, S, G<sub>2</sub>, M phase). With virtually no G<sub>1</sub> or G<sub>2</sub> phases this results in a reduction in cytoplasmic volume of each daughter cell with each cell division.
First cell divisions of the zygote forming initially 2 blastomeres and continuing to divide to form the [[M#morula|morula]]. Stage 2 is shown in the lower panel of the left hand image.
 
 
 
This early mitosis is a unique embryonic cell cycle (M, S, M phases) compared to adult (M, G<sub>1</sub>, S, G<sub>2</sub>, M phase). With virtually no G<sub>1</sub> or G<sub>2</sub> phases this results in a reduction in cytoplasmic volume of each daughter cell with each cell division.





Revision as of 15:04, 5 April 2010

Introduction

Human-oocyte to blastocyst.jpg

First cell divisions of the zygote forming initially 2 blastomeres and continuing to divide to form the morula. Stage 2 is shown in the lower panel of the left hand image.


This early mitosis is a unique embryonic cell cycle (M, S, M phases) compared to adult (M, G1, S, G2, M phase). With virtually no G1 or G2 phases this results in a reduction in cytoplasmic volume of each daughter cell with each cell division.


Facts: Week 1, 2-3 days, size 0.1-0.2 mm

Features: zona pellucida, blastomeres

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, March 29) Embryology Carnegie stage 2. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_2

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G