Carnegie stage 21
Embryology - 26 Apr 2024 Expand to Translate |
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Introduction
Facts
Week 8, 53 - 54 days, 22 - 24 mm
Gestational age GA week 10
Events
- Ectoderm: sensory placodes, nasal pits moved ventrally, fourth ventricle of brain
- Mesoderm: heart prominence, ossification continues
- Head: nose, eye, external acoustic meatus
- Body: straightening of trunk, heart, liver, umbilical cord
- Limb: upper limbs longer and bent at elbow, foot plate with digital rays begin to separate, wrist, hand plate with webbed digits
Features
- scalp vascular plexus, eylid, eye, nose, auricle of external ear, arm, elbow, wrist, knee, notch between digital rays, umbilical cord
- Identify: straightening of trunk, pigmented eye, eyelid, nose, external acoustic meatus, scalp vascular plexus, webbed digits, 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 | Category:Carnegie Stage 21 | Stage 22
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.
Central Nervous System | |
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lateral view | medial view |
scale bar = 1mm |
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 21: 7592 Right | 7592 Anterior | 7592 Left | 8553 Right | 8553 Anterior | 8553 Left | 4090 Right | 4090 Anterior | 4090 Left
Carnegie Collection - Stage 21 | |||||||||||
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Serial No. | Size (mm) | Grade | Fixative | Embedding Medium | Plane | Thinness (µm) | Stain | Point Score | Sex | Year | Notes |
22 | E, 20 Ch, 35x30x30 | Good | Alc. | P | Transverse | 50 | Al. coch. | 34.5 | Female | 1895 | |
57 | E, 23 Ch., ca. 30 | Poor | Alc. | P | Sagittal | 50 | Al. coch. | 36 | Male | 1896 | |
128 | E, 20 Ch., 50x43 | Good | Formalin | P | Coronal | 50 | Al. coch. | 33 | Female | 1898 | |
229 | E, 19 | Poor | Alc. | P | Sagittal | 50 | Al. coch. | 33 | Female | 1903 | |
349 | E, 24 | Good | Zenker | C | Coronal | 250 | Unstained | 36 | ? | 1905 | Double vascular injection |
455 | E, 24 Ch., 42x34x20 | Good | Alc. | P | Transverse | 30 | (Stain - Haematoxylin Eosin) | 36.5 | Male | 1910 | |
632 | E, 24 Ch., 60x50x30 | Good | Bichlor. acetic | P | Sagittal | 40, 100, 250 | Al. coch. | 33 | Female | 1913 | Injected |
903C | E, 23.5 | Good | Formalin | P | Transverse | 40 | Al. coch. | 38.5 | Female | 1914 | |
1008 | E, 26,4 | Good | Formalin | P | Sagittal | 40 | Al. coch. | 39 | ?? | 1914 | |
1358F | E, 23 | Good | Formalin | P | Sagittal | 40 | Al. coch. | 37.5 | Female | 1916 | |
2937 | E,, 24.2 | Good | Bouin | P | Transverse | 50 | (Stain - Haematoxylin Eosin) aur., or. G. | 39 | Female | 1920 | |
3167 | E., 24.5 Ch., 60x50x40 | Poor | Bichlor, acetic, formol | P | Transverse | 20 | Al. coch. | 32 | Male | 1920 | |
4090 | E, 22.2 Ch.. 66x46x30 | Good | Formalin | P | Transverse | 40 | Al. coch. | 30 | Female | 1922 | |
4160 | E,25 | Poor | Formalin | P | Sagittal | 25 | (Stain - Haematoxylin Eosin) | 39 | Male | 1923 | Tubal |
4960 | E.22 Ch,, 47x42x28 | Good | Formalin | P | Transverse | 15 | Al. coch., Mallory | 31.5 | Female | 1925 | |
5??6 | E. 215 | Good | Formalin | P | Sagittal | 20 | (Stain - Haematoxylin Eosin) | 34 | Female | 1927 | |
6531 | E,22 | Poor | Glacial acetic, | C-P | Transverse | 10 | (Stain - Haematoxylin Eosin) | 31.5 | Female | 1931 | Leitz Collection |
7254 | E,225 | Exc | Bouin | C-P | Transverse | 20 | (Stain - Haematoxylin Eosin) | 33.5 | Male | 1936 | |
7592 | E,22-> | Exc. | Bouin | C-P | Transverse | 20 | (Stain - Haematoxylin Eosin) | 36 | Female | 1937 | |
7864 | E., 24 | Exc, | Formalin | C-P | Frontal | 20 | (Stain - Haematoxylin Eosin) | 32.5 | Male | 1941 | |
8553 | E., 22 | Exc | Bouin | C-P | Transverse | 12 | (Stain - Haematoxylin Eosin) | 38 | Female | 1947 | |
9614 | E,,22 5 | Exc | Bouin | P | Coronal | 10 &15 | Azan | ? | ? | 1958 | Rubella. Hysterectomy |
Abbreviations
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iBook - Carnegie Embryos | |
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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 21. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_21
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G