Carnegie stage 22
Introduction
Facts
Week 8, 54 - 56 days, 23 - 28 mm
Events
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
Features
Identify: straightening of trunk, pigmented eye, eyelid, nose, external acoustic meatus, ear auricle, scalp vascular plexus, separated digits (fingers), thigh, ankle, 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 22 | Stage 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
Stage 22 Serial Section Images
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
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A1L | A2L | A3L | A4L | A5L | A6L | A7L |
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B1L | B2L | B3L | B4L | B5L | B6L | B7L |
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C1L | C2L | C3L | C4L | C5L | C6L | C7L |
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D1L | D2L | D3L | D4L | D5L | D6L | D7L |
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E1L | E2L | E3L | E4L | E5L | E6L | E7L |
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F1L | F2L | F3L | F4L | F5L | F6L | F7L |
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G1L | G2L | G3L | G4L | G5L | G6L | G7L |
Unlabeled
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A1 | A2 | A3 | A4 | A5 | A6 | A7 |
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B1 | B2 | B3 | B4 | B5 | B6 | B7 |
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C1 | C2 | C3 | C4 | C5 | C6 | C7 |
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D1 | D2 | D3 | D4 | D5 | D6 | D7 |
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E1 | E2 | E3 | E4 | E5 | E6 | E7 |
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F1 | F2 | F3 | F4 | F5 | F6 | F7 |
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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 |
Stage 22 Movies
Movies - Embryo Carnegie stage 22 - These are rotating embryo animations based upon reconstruction of serial slice images.
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Gastrointestinal | Cardiovascular | Central Nervous | Urogenital | Skeletal |
Additional Images
High Resolution Images
Stage 22 Movies
Template:Embryo stage 22 movies
- 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 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