File:Stage7 notochord.jpg: Difference between revisions
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* This tube forms first the axial process then notochordal process, then finally the notochord. | * This tube forms first the axial process then notochordal process, then finally the notochord. | ||
===Notochord== | ===Notochord=== | ||
* The notochord is a key to embryonic folding and regulation of ectoderm and mesoderm differentiation. | * The notochord is a key to embryonic folding and regulation of ectoderm and mesoderm differentiation. | ||
* It lies in the rostrocordal axis | * It lies in the rostrocordal axis |
Revision as of 15:04, 15 May 2011
Carnegie Stage 7 showing the notochord or axial mesoderm region of the embryonic disc
Features: embryonic disc, primitive node, primative streak, primative groove, yolk sac
Facts: Week 3, 15 - 17 days, 0.4 mm
View 1: embryonic disc, showing the epiblast viewed from the amniotic (dorsal) side.
Events: Gastrulation is continuing as cells migrate from the epiblast, continuing to form mesoderm.
- Mesoderm lies between the ectoderm and endoderm as a continuous sheet except at the buccopharyngeal and cloacal membranes.
- These membranes have ectoderm and endoderm only and will lie at the rostral (head) and caudal (tail) of the gastrointestinal tract.
- From the primitive node a tube extends under the ectoderm in the opposite direction to the primitive streak.
- This tube forms first the axial process then notochordal process, then finally the notochord.
Notochord
- The notochord is a key to embryonic folding and regulation of ectoderm and mesoderm differentiation.
- It lies in the rostrocordal axis
- the embryonic disc will fold either side of the notochord ventrally
- pinching off a portion of the yolk sac to form the lining of the gastrointestinal tract.
- the embryonic disc will fold above and below the notochord ventrally
- bringing the heart to upper abdomen
- brining the connecting stalk to the umbilicus
- Stage 7 Mesoderm: axial | paraxial | intermediate | lateral plate
Image Source: UNSW Embryology http://embryology.med.unsw.edu.au/wwwhuman/Stages/stage7.htm
No image reuse without permission.
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 11:21, 10 August 2009 | 690 × 800 (70 KB) | MarkHill (talk | contribs) | Carnegie Stages 7 showing the notochord or axial mesoderm region of the embryonic disc. Features: embryonic disc, primitive node, primative streak, primative groove, yolk sac Facts: Week 3, 15 - 17 days, 0.4 mm View 1: embryonic disc, showing the epibl |
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File usage
The following 24 pages use this file:
- 2009 Lecture 5
- 2010 BGD Lecture - Development of the Embryo/Fetus 2
- 2010 BGD Practical 6 - Week 3
- 2010 Lab 3
- 2010 Lecture 5
- 2011 Lab 3 - Week 3
- ANAT2341 Lab 3 - Week 3
- BGDA Lecture - Development of the Embryo/Fetus 2
- BGDA Practical 7 - Week 3
- Lecture - Mesoderm Development
- Lecture - Week 3 Development
- Mesoderm
- Talk:2010 BGD Practical 6 - Week 3
- Talk:2011 Lab 3
- File:Stage7-sem2.jpg
- File:Stage7 800x700px.jpg
- File:Stage7 cloacal-oral-membranes.jpg
- File:Stage7 intermediate-mesoderm.jpg
- File:Stage7 lateral-plate.jpg
- File:Stage7 mesoderm.jpg
- File:Stage7 notochord.jpg
- File:Stage7 paraxial-mesoderm.jpg
- File:Stage7 primitive-streak-node.jpg
- Template:Stage 7 mesoderm images