Carnegie stage 2: Difference between revisions
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==Introduction== | ==Introduction== | ||
{| | |||
| width=220px|[[File:Stage2.jpg]] | |||
| First cell mitotic divisions of the zygote forming initially 2 blastomeres that continue to divide to form the [[M#morula|morula]], a "berry", a solid mass of cells. | |||
[[File: | 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. | ||
===Summary=== | |||
* Week 1, 2 - 3 days, size 0.1 - 0.2 mm | |||
* [[Morula]], [[Z#zona pellucida|zona pellucida]], [[B#blastomeres|blastomeres]] | |||
See also [[#Events|Events]] | |||
{{Carnegie stage 2 links}} | |||
|} | |||
{{Carnegie_stage_table_1}} | |||
{{Carnegie stages}} | |||
<br> | |||
{| border='0px' | |||
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| [[File:Hertig1956 fig01.jpg|400px]] | |||
| [[File:Hertig1956 fig02.jpg|400px]] | |||
|- | |||
| Two-cell segmenting egg | |||
| Mid-serial section two-cell | |||
|- | |||
| [[File:Human embryo day 2.jpg|Stage 2 Day 2]] | |||
| [[File:Human embryo day 3.jpg|Stage 2 Day 3]] | |||
|- | |||
| Human Embryo (day 2) | |||
| Human Embryo (day 3) | |||
|- | |||
|} | |||
See also [[:File:Human-oocyte_to_blastocyst.jpg|Human oocyte to blastocyst]] | |||
==Carnegie Collection== | |||
[[File:Stage2_bf01.jpg|500px]] | |||
Two cell blastomere (1-2 days) | |||
{{Carnegie Collection stage 2 table}} | |||
==Events== | |||
* {{mitosis}} | |||
===References=== | |||
<references/> | |||
{{Ref-Hertig1956}} | |||
==Additional Images== | |||
{{Carnegie_stages}} | |||
{{ | {{Footer}} | ||
[[Category:Human Embryo]] [[Category:Carnegie Stage]] [[Category:Carnegie Stage 2]] [[Category:Week 1]] | [[Category:Human Embryo]] [[Category:Carnegie Stage]] [[Category:Carnegie Stage 2]] [[Category:Week 1]] |
Revision as of 00:17, 7 June 2018
Embryology - 26 Apr 2024 Expand to Translate |
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Introduction
First cell mitotic divisions of the zygote forming initially 2 blastomeres that continue to divide to form the morula, a "berry", a solid mass of cells.
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. Summary
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Week: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
Carnegie stage: | 1 2 3 4 | 5 6 | 7 8 9 | 10 11 12 13 | 14 15 | 16 17 | 18 19 | 20 21 22 23 |
- 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
Two-cell segmenting egg | Mid-serial section two-cell |
Human Embryo (day 2) | Human Embryo (day 3) |
See also Human oocyte to blastocyst
Carnegie Collection
Two cell blastomere (1-2 days)
Carnegie Collection - Stage 2 | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Serial No. | Normality | No. of Blastomeres | Size of Fixed Specimen (µm) | Fixative | Embedding Medium | Thinness (µm) | Stain | Year | Notes | |
8190 | abnormal | 9 | 160x104 | Alc. & Bouin | C-P | 6 | Iron h., or G | 1943 | Hertig et al. (1954) | |
8260 | in vitro | 2 | 50x75 | Bouin | C-P | 8 | (Stain - Haematoxylin Eosin) | 1944 | Menkin and Rock (1948) | |
8450 | abnormal | 8 | 100x96 | Alc. & Bouin | C-P | 6 | (Stain - Haematoxylin Eosin), phlox. | 1947 | Hertig et al. (1954) | |
8452 | abnormal | 12 | 110x93 | Alc. & Bouin | C-P | 6 | (Stain - Haematoxylin Eosin), phlox. | 1946 | Hertig et al. (1954) | |
8500.1 | in vitro | 3 | 50x86 | Bouin | C-P | 8 | (Stain - Haematoxylin Eosin) | 1947 | Menkin and Rock (1948) | |
8630 | abnormal | 5 | 104x94 | Alc. & Bouin | C-P | 6 | (Stain - Haematoxylin Eosin) | 1948 | Hertig et al. (1954) | |
8698 | normal | 2 | 122x88 | Alc. & Bouin | C-P | 6 | (Stain - Haematoxylin Eosin) | 1949 | Hertig et al. (1954) | |
8904 | normal | 12 | 115 | Specimen lost | 1951 | Hertig et al. (1954) | ||||
Abbreviations
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Events
References
Hertig AT. Rock J. and Adams EC. A description of 34 human ova within the first 17 days of development. (1956) Amer. J Anat., 98:435-493.
Additional Images
- 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 26) Embryology Carnegie stage 2. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_2
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G