Carnegie stages
Lua error in package.lua at line 80: module 'strict' not found.
In embryology, Carnegie stages are a standardized system of 23 stages used to provide a unified developmental chronology of the vertebrate embryo.
The stages are delineated through the development of structures, not by size or the number of days of development, and so the chronology can vary between species, and to a certain extent between embryos. In the human being only the first 60 days of development are covered; at that point the term embryo is usually replaced with the term fetus.
It was based on work by Streeter (1942) and O'Rahilly and Müller (1987). The name "Carnegie stages" comes from the Carnegie Institution of Washington.
While the Carnegie stages provide a universal system for staging and comparing the embryonic development of most vertebrates, other systems are occasionally used for the common model organisms in developmental biology, such as the Hamburger–Hamilton stages in the chick.
Contents
- 1 Stages
- 1.1 Stage 1: 1 days
- 1.2 Stage 2: 2-3 days
- 1.3 Stage 3: 4-5 days
- 1.4 Stage 4: 6 days
- 1.5 Stage 5 (a-c): 7-12 days
- 1.6 Stage 6: ca 17 days
- 1.7 Stage 7: ca 19 days
- 1.8 Stage 8: ca 23 days
- 1.9 Stage 9: ca 25 days
- 1.10 Stage 10: ca 28 days
- 1.11 Stage 11: ca 29 days
- 1.12 Stage 12: ca 30 days
- 1.13 Stage 13: ca 32 days
- 1.14 Stage 14: ca 33 days
- 1.15 Stage 15: ca 36 days
- 1.16 Stage 16: ca 39 days
- 1.17 Stage 17: ca 41 days
- 1.18 Stage 18: ca 44 days
- 1.19 Stage 19: ca 46 days
- 1.20 Stage 20: ca 49 days
- 1.21 Stage 21: ca 51days
- 1.22 Stage 22: ca 53 days
- 1.23 Stage 23: ca 56 days
- 2 See also
- 3 External links
Stages
Days are approximate, and reflect the days since the last ovulation before pregnancy ("Postovulatory age").
Stage 1: 1 days
Stage 2: 2-3 days
Stage 3: 4-5 days
- blastocyst and blastocoele
- trophoblast and embryoblast
Stage 4: 6 days
- syncytiotrophoblast
- cytotrophoblast
- amniotic ectoderm
Stage 5 (a-c): 7-12 days
Stage 6: ca 17 days
Stage 7: ca 19 days
- gastrulation
- neural plate
- start of hematopoiesis
- notochord
Stage 8: ca 23 days
Stage 9: ca 25 days
Stage 10: ca 28 days
Stage 11: ca 29 days
Stage 12: ca 30 days
- upper limb buds
Stage 13: ca 32 days
Stage 14: ca 33 days
Stage 15: ca 36 days
Stage 16: ca 39 days
Stage 17: ca 41 days
· implementation embryo in posterior uterus wall
Stage 18: ca 44 days
Stage 19: ca 46 days
Stage 20: ca 49 days
Stage 21: ca 51days
Stage 22: ca 53 days
Stage 23: ca 56 days
See also
External links
- Stages at UNSW Embryology
- Swiss embryology (from UL, UB, and UF) iperiodembry/carnegie02
- Embryology at UNSW wwwhuman/Stages/carnegie
- Overview at umich.edu
- Details on stages at lsuhsc.edu
- List of structures by week, at mrc.ac.uk
- Diagrams at actual size at Visible Embryo
<templatestyles src="Asbox/styles.css"></templatestyles>
 |
This anatomy article is a stub. You can help Wikipedia by expanding it. |
<templatestyles src="Asbox/styles.css"></templatestyles>
 |
This human reproduction article is a stub. You can help Wikipedia by expanding it. |
