Carnegie stage 2: Difference between revisions
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==Introduction== | ==Introduction== | ||
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[[File:Stage2.jpg | | [[File:Stage2.jpg]] | ||
First cell divisions of the zygote forming initially 2 blastomeres and continuing to divide to form the [[M#morula|morula]]. | | 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. | 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. | ||
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'''Features:''' [[Z#zona pellucida|zona pellucida]], [[B#blastomeres|blastomeres]] | '''Features:''' [[Z#zona pellucida|zona pellucida]], [[B#blastomeres|blastomeres]] | ||
'''Links:''' [[Week 1]] | [[Blastocyst]] | [[Lecture - Week 1 and 2 Development|Lecture]] | [[BGDA_Practical_-_Fertilization_to_Implantation|Medicine Practical]] | [[2011_Lab_2|Science Practical]] | [[ | '''Links:''' [[Week 1]] | [[Blastocyst]] | [[Lecture - Week 1 and 2 Development|Lecture]] | [[BGDA_Practical_-_Fertilization_to_Implantation|Medicine Practical]] | [[2011_Lab_2|Science Practical]] | [[Carnegie_stage_3|Stage 3]] | ||
{{Carnegie stages}} | |||
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Revision as of 06:47, 25 October 2011
Introduction
First cell divisions of the zygote forming initially 2 blastomeres and continuing to divide to form the morula.
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 Links: Week 1 | Blastocyst | Lecture | Medicine Practical | Science Practical | Stage 3
See also Human oocyte to blastocyst
Cite this page: Hill, M.A. (2024, May 4) Embryology Carnegie stage 2. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_2
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