Carnegie stage 2: Difference between revisions

From Embryology
No edit summary
(12 intermediate revisions by the same user not shown)
Line 1: Line 1:
{{header}}
==Introduction==
==Introduction==
{|
{|
| [[File:Stage2.jpg]]
| 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.
| 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.


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.


'''Facts:''' Week 1, 2 - 3 days, size 0.1 - 0.2 mm
===Summary===
* Week 1, 2 - 3 days, size 0.1 - 0.2 mm
* [[Morula]], [[Z#zona pellucida|zona pellucida]], [[B#blastomeres|blastomeres]]


'''Features:''' [[Z#zona pellucida|zona pellucida]], [[B#blastomeres|blastomeres]]


'''Links:''' [[Week 1]] | [[Blastocyst]] | [[Cell Division - Mitosis|Mitosis]] | [[Lecture - Week 1 and 2 Development|Lecture]] | [[BGDA_Practical_-_Fertilization_to_Implantation|Medicine Practical]] | [[2011_Lab_2|Science Practical]] | [[Carnegie_stage_3|Stage 3]]
See also [[#Events|Events]]
 
{{Carnegie stage 2 links}}
|}
|}
{{Carnegie_stage_table_1}}


{{Carnegie stages}}
{{Carnegie stages}}
 
<br>
{| border='0px'
{| border='0px'
 
|-
| [[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 2.jpg|Stage 2 Day 2]]
Line 26: Line 37:
|}
|}


See also [[:File:Human-oocyte_to_blastocyst.jpg|Human oocyte to blastocyst]]  
See also [[:File:Human-oocyte_to_blastocyst.jpg|Human oocyte to blastocyst]]
 


==Carnegie Collection==
==Carnegie Collection==
Line 36: Line 46:




{{Template:Carnegie_stages}}
{{Carnegie Collection stage 2 table}}
{{Template:Footer}}
 
==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 01:17, 7 June 2018

Embryology - 29 Mar 2024    Facebook link Pinterest link Twitter link  Expand to Translate  
Google Translate - select your language from the list shown below (this will open a new external page)

العربية | català | 中文 | 中國傳統的 | français | Deutsche | עִברִית | हिंदी | bahasa Indonesia | italiano | 日本語 | 한국어 | မြန်မာ | Pilipino | Polskie | português | ਪੰਜਾਬੀ ਦੇ | Română | русский | Español | Swahili | Svensk | ไทย | Türkçe | اردو | ייִדיש | Tiếng Việt    These external translations are automated and may not be accurate. (More? About Translations)

Introduction

Stage2.jpg 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


See also Events

Stage 2 Links: Week 1 | Morula | Blastocyst | Mitosis | Zona pellucida | Lecture | Medicine Practical | Science Practical | Next Stage 3
  Historic Papers: 1956
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


Hertig1956 fig01.jpg Hertig1956 fig02.jpg
Two-cell segmenting egg Mid-serial section two-cell
Stage 2 Day 2 Stage 2 Day 3
Human Embryo (day 2) Human Embryo (day 3)

See also Human oocyte to blastocyst

Carnegie Collection

Stage2 bf01.jpg

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
  • Embedding medium - paraffin (P) or a combination of celloidin and paraffin (C-P).
  • Fixative - formalin (Formol), alcohol and formalin (Alc, formol), Bouin (Bouin solution)
  • ? - unknown or not determined.

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

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