Carnegie stage 22: Difference between revisions
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* [[Sensory_-_Vision_Development|Vision]] - (stage 19 -22) the eyelid folds develop into the eyelids and cover more of the eye as the palpebral fissure takes shape. The upper and the lower eyelids meet at the outer canthus in Stage 19. <ref name=“PMID7364662”><pubmed>7364662</pubmed></ref> | * [[Sensory_-_Vision_Development|Vision]] - (stage 19 -22) the eyelid folds develop into the eyelids and cover more of the eye as the palpebral fissure takes shape. The upper and the lower eyelids meet at the outer canthus in Stage 19. <ref name=“PMID7364662”><pubmed>7364662</pubmed></ref> | ||
* [[Endocrine System Development]]<ref name=O'Rahilly1983a>{{Ref-O'Rahilly1983a}}</ref> | * [[Endocrine System Development]]<ref name=O'Rahilly1983a>{{Ref-O'Rahilly1983a}}</ref> | ||
** Parathyroids - Parathyroids 4 become detached from the pharyngeal | ** Parathyroids - Parathyroids 4 become detached from the pharyngeal endoderm (Jirfisek 1980). | ||
** Adrenal Cortex - the C2 cells have changed and resemble fibrocytes.<ref name=Crowder1957>{{Ref-Crowder1957}}</ref> | ** Adrenal Cortex - the C2 cells have changed and resemble fibrocytes.<ref name=Crowder1957>{{Ref-Crowder1957}}</ref> | ||
Revision as of 09:52, 1 November 2016
Embryology - 15 Jun 2024 Expand to Translate |
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Introduction
Facts
Week 8, 54 - 56 days, 23 - 28 mm
Gestational age GA week 10
Summary
- Ectoderm:
- 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 webbed digits, wrist, hand plate with separated digits
See also Carnegie stage 22 Events
Features
- Identify: straightening of trunk, pigmented eye, eyelid, nose, external acoustic meatus, ear auricle, scalp vascular plexus, separated digits (fingers), thigh, ankle, umbilical cord
- hearing - cochlea continues spiral growth.
- Links: Week 8 | System Development | Lecture - Limb | Lecture - Head Development | Lecture - Sensory | Science Practical - Head | Science Practical - Sensory | Science Practical - Urogenital | Category:Carnegie Stage 22 | Stage 23
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
Kyoto Collection
Lateral view. 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.
Image source: Embryology page Created: 19.03.1999
Carnegie Collection
iBook - Carnegie Embryos | |
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Hinrichsen Collection
ME 31 Carnegie stage 22
Image source: The Hinrichsen Collection images are reproduced with the permission of Prof. Beate Brand-Saberi, Head, Department of Anatomy and Molecular Embryology, Ruhr-Universität Bochum. Images are for educational purposes only and cannot be reproduced electronically or in writing without permission.
Stage 22 Movies
Movies - Embryo Carnegie stage 22 - These are rotating embryo animations based upon reconstruction of serial slice images.
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These 3d movies were part of the UNSW Medical degree Independent Learning Project (ILP) prepared by Aashish Kumar (2006).
Stage 22 Serial Section Images
Virtual Slides
These are high resolution histological sections (Stain - Haematoxylin Eosin) through regions of the Stage 22 human embryo from the original serial section set shown below. See also High resolution image extracts. |
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High Resolution Images
Serial Sections
These are the original serial images prepared from embryo sections for Embryology practical classes and transferred online in 1996.
- Links: Carnegie stage 22 - serial sections | Carnegie stage 13 - serial sections | Carnegie stage 13
Labeled
A1L | A2L | A3L | A4L | A5L | A6L | A7L |
B1L | B2L | B3L | B4L | B5L | B6L | B7L |
C1L | C2L | C3L | C4L | C5L | C6L | C7L |
D1L | D2L | D3L | D4L | D5L | D6L | D7L |
E1L | E2L | E3L | E4L | E5L | E6L | E7L |
F1L | F2L | F3L | F4L | F5L | F6L | F7L |
G1L | G2L | G3L | G4L | G5L | G6L | G7L |
Unlabeled
A1 | A2 | A3 | A4 | A5 | A6 | A7 |
B1 | B2 | B3 | B4 | B5 | B6 | B7 |
C1 | C2 | C3 | C4 | C5 | C6 | C7 |
D1 | D2 | D3 | D4 | D5 | D6 | D7 |
E1 | E2 | E3 | E4 | E5 | E6 | E7 |
F1 | F2 | F3 | F4 | F5 | F6 | F7 |
G1 | G2 | G3 | G4 | G5 | G6 | G7 |
Stage 22 Selected Serial Section Images
About Stage 22 Embryo Sections - The Carnegie stage 22 human embryo is 27 mm (CRL) in size and approximately equal to day 54 - 56 of development (week 8). These images have been selected to show some key features of late embryo development.
- Links: Carnegie stage 22 - selected serial sections | Carnegie stage 22 - serial sections | Carnegie stage 22 | Embryo Serial Sections
Stage 22 serial unlabeled images | Stage 22 Serial labeled images |
Events
- Vision - (stage 19 -22) the eyelid folds develop into the eyelids and cover more of the eye as the palpebral fissure takes shape. The upper and the lower eyelids meet at the outer canthus in Stage 19. [2]
- Endocrine System Development[3]
- Parathyroids - Parathyroids 4 become detached from the pharyngeal endoderm (Jirfisek 1980).
- Adrenal Cortex - the C2 cells have changed and resemble fibrocytes.[4]
References
- ↑ Streeter GL. Developmental Horizons In Human Embryos Description Or Age Groups XIX, XX, XXI, XXII, And XXIII, Being The Fifth Issue Of A Survey Of The Carnegie Collection. (1957) Carnegie Instn. Wash. Publ. 611, Contrib. Embryol., 36: 167-196.
- ↑ <pubmed>7364662</pubmed>
- ↑ O'Rahilly R. The timing and sequence of events in the development of the human endocrine system during the embryonic period proper. (1983) Anat. Embryol., 166: 439-451. PMID 6869855
- ↑ Crowder RE. The development of the adrenal gland in man, with special reference to origin and ultimate location of cell types and evidence in favor of the "cell migration" theory. (1957) Contrib. Embryol., Carnegie Inst. Wash. 36, 193-210.
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, June 15) Embryology Carnegie stage 22. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_22
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G