Introduction
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Facts: Week 1 - 2, size 0.1 - 0.2 mm
Features: implantation completed, inner cell mass, bilaminar embryo, trophoblast development.
- The conceptus completes implantation during this stage.
- The trophoblast cells (syncytiotrophoblast and cytotrophoblast) proliferate. Syncytiotrophoblast cells continue to invade the maternal endometrium and cytotrophoblast cells form clumps that will later form sites of chorionic villi formation.
- The maternal endometrium locally begins the decidual process and the endometrial stroma accumulates fluid (edematous).
- The extraembryonic cavities begin to form.
- The bilaminar embroyonic disc forms from the inner cell mass (embryoblast).
- Links: Week 2 | Implantation | Lecture | Practical | Stage 6
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- 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
File:Chorion 001 icon.jpg</wikiflv>
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Animation (left) shows the events following implantation and focuses on changes in the the spaces surrounding the embryonic disc, the extraembryonic coelom.
The blastoceol cavity is converted into two separate spaces: the yolk sac and the chorionic cavity.
The third space lies above the epiblast, the amniotic cavity.
- blue - epiblast layer
- yellow - hypoblast layer
- red cells - extraembryonic mesoderm layer
- green - trophoblast layer
- red spaces - blood-filled spaces, maternal lacunae
- white cells - (left) endometrial gland (right) endometrial epithelium
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Quicktime movie
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Carnegie Collection
Stage 5a
Stage 5b
Stage 5c
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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- 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
Glossary Links
- Glossary: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Numbers | Symbols | Term Link
Cite this page: Hill, M.A. (2024, March 28) Embryology Carnegie stage 5. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_5
- What Links Here?
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G