Carnegie stage 5: Difference between revisions
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| [[File:Stage5 bf11b.jpg|500px]] | | [[File:Stage5 bf11b.jpg|500px]] | ||
| valign="top"| '''Facts:''' Week 1-2, size 0.1 - 0.2 mm | | valign="top"| '''Facts:''' Week 1 - 2, size 0.1 - 0.2 mm | ||
'''Features:''' implantation completed, inner cell mass, bilaminar embryo, trophoblast development | '''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). | |||
Revision as of 08:30, 24 September 2011
Facts: Week 1 - 2, size 0.1 - 0.2 mm
Features: implantation completed, inner cell mass, bilaminar embryo, trophoblast development
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File:Chorion 001 icon.jpg</wikiflv> |
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.
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Quicktime movie |
Stage 5a
Stage 5b
Stage 5c
- 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 24) Embryology Carnegie stage 5. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_5
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G