Carnegie stage 20: Difference between revisions
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{{Carnegie Embryo iBook table}} | {{Carnegie Embryo iBook table}} |
Revision as of 12:01, 1 July 2016
Embryology - 27 Jun 2024 Expand to Translate |
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Introduction
Facts
Week 8, 51 - 53 days, 18 - 22 mm
Gestational age GA week 10
Summary
- Ectoderm: sensory placodes, lens pit, otocyst, nasal pits moved ventrally, fourth ventricle of brain
- Mesoderm: heart prominence, ossification continues
- Head: forebrain, eye, external acoustic meatus
See also Events
Features
- scalp vascular plexus, eylid, eye, nose, external acoustic meatus, auricle of external ear, arm, elbow, wrist, liver prominence, digital rays
- Identify: straightening of trunk, pigmented eye, eyelid, nose, external acoustic meatus, scalp vascular plexus, digital rays, liver prominance, thigh, ankle, foot plate, umbilical cord
- Links: Week 8 | System Development | Lecture - Limb | Lecture - Head Development | Lecture - Sensory | Science Practical - Head | Science Practical - Sensory | Science Practical - Urogenital | Historic - Skull Development | Category:Carnegie Stage 20 | Stage 21
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
Virtual Embryo Slides
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Kyoto Collection
View: This is a dorsolateral view of embryo. 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 stage 20: 8517 Right | 8517 Anterior | 8517 Left | 7906 Right | 7906 Anterior | 7906 Left | 7274 Right | 7274 Anterior | 7274 Left
Carnegie Collection - Stage 20 | |||||||||||
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Serial No. | Size (mm) | Grade | Fixative | Embedding Medium | Plane | Thinness (µm) | Stain | Point Score | Sex | Year | Notes |
240 | E, 20 Ch, 50x40x30 | Poor | Formalin | P | Coronal | 20 | Iron H. | 27 | d | 19?? | |
256 | E, 21 | poor | Alc | p | Sagittal | 25 | Coch. | 23 | M | 1904 | Tubal. Partial anencephaly |
353 | E, 20 | Poor | Alc | P | Sagittal | 20 | H. & Congo red | 22,5 | M | 1906 | |
431 | E, 19 Ch, 30x25x25 | Good | Formalin | P | Sagittal | 20 | H. & Congo red | 25,5 | M | 1908 | Tubal |
437 | E, 23 Ch., 80x60x50 | Poor | Formalin | P | Sagittal | 50 | Coch | 24 | M | 193? | |
453 | E, 23 Ch, 60x40x30 | Poor | Formalin | P | Sagittal | 20 | H. & Congo red | 23-5 | ? | 1910 | Injected |
460 | E, 21 | Exc. | Bichlor. acetic | P | Transverse | 40 | (Stain - Haematoxylin Eosin), coch, | 24.5 | M | 1910 | injected |
462 | E, 20 Ch, 50x40x30 | Exc. | Formalin | P | Transverse | 40 | Al, coch | 23.5 | F | 1910 | |
635B | E, 22 | Poor | Alc | P | Transverse | 50 | Al, coch | 26.5 | M | 1913 | |
657 | E, 25 Ch, 35x20x15 | Poor | Formalin | C | Sagittal | 40 | Al, coch | 26.5 | M | 1913 | Tubal |
966 | E, 23 Ch, 51x38x13 | Exc | Bichlor. acetic | P | Coronal | 40 | (Stain - Haematoxylin Eosin), aur, or. G | 25 | M | 1911 | Tubal |
1134B | E, 23 | Poor | Formalin | p | Sagittal | 100 | Al. coch., | 22 | - | 1915 | |
1266 | E, 23.1 | Poor | Formalin | C-P | Sagittal | 25 | Al. coch., (Stain - Haematoxylin Eosin) aur, or G | 20.5 | F | 191? | |
2393 | Ch, 61.5x50x35 | Poor | |||||||||
3527 | E., 22 Ch. 32x30x10 | Good | Formalin | P | Sagittal | 25 | Al. coch., | 28 | ? | 1921 | |
4059 | E, 21.6 | Good | Formalin | P | Coronal | 15 | Al. coch., Mallory | 29.5 | $ | 1922 | |
4148 | E, 21 Ch. 45x34x30 | Good | Formalin | p | Coronal | 15 | A1. coch., Mallory | 19 | ? | 1922 | |
4361 | E, 22 Ch., 52x42x23 | poor | Formalin | 9 | Transverse | 20 | Coch. | 24 | 8 | 1923 | |
6202 | E, 21 Ch., 35x35x22 | Exc | Bouin | P | Sagittal | 20 | (Stain - Haematoxylin Eosin) | 20.5 | 8 | 1930 | Tubal |
6426 | E 21.5 | Good | Formalin | C—P | Transverse | 20 | (Stain - Haematoxylin Eosin) | 21 | 3 | 1931 | |
7274 | E, 18.5 Ch., 48x44x35 | Exc | Bouin | C—P | Transverse | 20 | (Stain - Haematoxylin Eosin), phlox. | 20 | M | 1936 | |
7906 | E19.5 | Exc | Bouin | C—P | Coronal | 20 | (Stain - Haematoxylin Eosin) | 22 | 8 | 1941 | Left renal agenesis |
8517 | E., 20.8 | Exc. | Bouin | C—P | Coronal | 20 | (Stain - Haematoxylin Eosin) | 24 | 8 | 1943 | |
8226 | E, 18.0 | Exc. | Bouin | C—P | Sagittal | 10 | Alan | ? | 3 | 1944 | |
Abbreviations
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iBook - Carnegie Embryos | |
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Blechschmidt Collection
Embryo (130758)
- Links: Blechschmidt Collection
Sydney University Collection
The following embryos were part of a 1943 study of testes development[1] Embryos based upon their CRL were probably Stage 20 to 21.
Embryo | Crown Rump Length (mm) | Gonad (mm) | Groin distance (mm) |
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H 125 | 20 | 2.4 | 1.0 |
H 181 | 20.6 | 2.8 | 1.1 |
H 271 | 21 | 3.0 | 0.7 |
H 408 | 22 | 2.3 | 1.0 |
Events
References
- ↑ Wyndham NR. A morphological study of testicular descent. J Anat. 1943 Jan;77(Pt 2):179-188.3. No abstract available. PMID 17104926
- ↑ 2.0 2.1 <pubmed>7364662</pubmed>
Additional Images
Historic Images
Historic Disclaimer - information about historic embryology pages |
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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) |
Lewis, WH. The Cartilaginous Skull Of A Human Embryo Twenty-One Millimeters In Length (1920) Contrib. to Embryol. 9:299-324.
Dickie JK. The Anatomy of the Head End of a 20 mm Human Embryo. J Anat Physiol. 1914 Jul;48(Pt 4):445-60. PMID 17233010
- 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, June 27) Embryology Carnegie stage 20. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_20
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G