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
- 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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- iTunes link | iBook Store
- Description - Imagine the excitement of seeing this incredible early period of human development for the first time. Now consider that much of our initial understanding of human development is based upon study of historic embryo collections. You can now look at these historic images of the first 8 weeks after fertilisation and explore for yourself the changes that occur in human development during this key period. This current book is designed as an atlas of the Carnegie embryo stages with some brief notes and additional information covering the first 8 weeks of development. These images are from from the beginning of last century and are one of the earliest documented series of human embryos collected for basic research and medical education on development. I hope you enjoy learning about the amazing early events that begin to make and shape us. This is the second book in a series of educational releases from UNSW Embryology.
- Release: First Edition - Mar 12, 2012 ISBN 978-0-7334-3148-7 Print Length 82 Pages, 25.8 MB Language English.
- PDF Preview version 3.87 MB (Read the associated information, this is an edited educational preview version with many features not functioning).
- The current website also includes numerous embryo images from this textbook (see Embryonic Development and 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.
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
High Resolution Images
- Selected Human Embryo Histology - Stage 22 (week 8)
developing cortex labeled
central nervous system and ventricles
central nervous system and ventricles
lens and pigmented epithelium
lens and pigmented epithelium
mesonephric ducts and bladder
developing testis labeled
developing testis labeled
pelvic region - rectum and bladder
pelvic region - rectum and bladder labeled
pelvic region - rectum labeled
Aorta filled with red blood cells
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
Unlabeled
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
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]
References
Additional Images
Stage 22 embryo rotated vertically
Stage 13 and 22 thyroid development
External ear Stages 14-23 and adult
Stage 22 Optical Projection Tomography
- 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
- What Links Here?
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G