Carnegie stage 12
Embryology - 15 Jun 2024 ![]() ![]() ![]() |
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Introduction
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FactsWeek 4, 26 - 30 days, 3 - 5 mm, Somite Number 21 - 29 Gestational Age GA week 6 Summary
Features
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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
Bright Field
Scanning EM
Image Source: Scanning electron micrographs of the Carnegie stages of the early human embryos are reproduced with the permission of Prof Kathy Sulik, from embryos collected by Dr. Vekemans and Tania Attié-Bitach. Images are for educational purposes only and cannot be reproduced electronically or in writing without permission.
Kyoto Collection
View: Lateral view, day 26, 27 somites, Amniotic membrane removed.
Image source: The Kyoto Collection images are reproduced with the permission of Prof. Kohei Shiota and Prof. Shigehito Yamada, Anatomy and Developmental Biology, Kyoto University Graduate School of Medicine, Kyoto, Japan for educational purposes only and cannot be reproduced electronically or in writing without permission.
Carnegie Collection
- 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
iBook - Carnegie Embryos | |
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Hill Collection
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right view | left view |
- Links: Hill Collection
Events
- Somitogenesis - stages 12 and 13 embryo somite 1 has dispersed and is now contributing to the hypoglossal cord. Therefore “in embryos with more than 20 somites” (beginning of stage 12), the first ones visible “actually are second somites”.[1]
References
- ↑ Arey, L. B. 1938. The history of the first somite in human embryos. Carnegie Instn. Wash. Publ. 496, Contrib. Embryoi, 27, 233-269.
Additional Images
Historic Images
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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding. (More? Embryology History | Historic Embryology Papers) |
Gray's Anatomy Fig. 472
Graphic reconstruction of embryo from serial sections PMID 17232769
- Historic Papers: 22 Somites | 23 Somites | 25 Somites | 27 Somites | Brain Vascular System of the Human Embryo
Glossary Links
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Cite this page: Hill, M.A. (2024, June 15) Embryology Carnegie stage 12. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_12
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G