Carnegie stage 9: Difference between revisions
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Image source: [http://embryology.med.unsw.edu.au/wwwhuman/Stages/stage9.htm Embryology page Created: 19.03.1999] | Image source: [http://embryology.med.unsw.edu.au/wwwhuman/Stages/stage9.htm Embryology page Created: 19.03.1999] | ||
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[[Category:Human Embryo]] [[Category:Carnegie Stage]] [[Category:Week 3]] | [[Category:Human Embryo]] [[Category:Carnegie Stage]] [[Category:Week 3]] |
Revision as of 12:50, 22 August 2009
Dorsal
Features: embryonic disc, primitive node, primative streak, primative groove, somites, neural groove, brain plate region, connecting stalk, cut edge of amnion
Facts: Week 3, 19 - 21 days, 1.5 - 2.5 mm, Somite Number 1 - 3
View 1: embryonic disc, showing the epiblast viewed from the amniotic (dorsal) side.
Events: Ectoderm - Neural plate brain region continues to expand, neural plate begins folding over the notochord. Mesoderm - segmentation of paraxial mesoderm begins (1 - 3 somite pairs), cardiac primordium forms
Identify: neural groove and neural folds, the mesoderm, which segments beside the neural groove to form somites but extends laterally to margin of embryonic disc lateral plate mesoderm, where it merges with the covering extraembryonic mesoderm.
The intra-embryonic coelom develops in the middle of the lateral plate mesoderm. Note amniotic ectoderm covered by extramebryonic mesoderm (empty spaces above and below the mesoderm are artefacts, as are the lateral folds in the ectoderm).
Ventral
View 2: embryonic disc, showing the epiblast, connecting stalk and brain fold.
Image source: Embryology page Created: 19.03.1999
- 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 27) Embryology Carnegie stage 9. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_9
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G