File:Stage7 notochord.jpg: Difference between revisions
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==Carnegie Stage 7 showing the notochord or axial mesoderm region of the embryonic disc== | ==Carnegie Stage 7 showing the notochord or axial mesoderm region of the embryonic disc== | ||
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* Week 3, 15 - 17 days, 0.4 mm, embryonic disc, showing the epiblast viewed from the amniotic (dorsal) side. | |||
* Mesoderm lies between the ectoderm and endoderm as a continuous sheet except at the [[B#buccopharyngeal membrane|buccopharyngeal]] and [[C#cloacal membrane|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 (in the centre of the embryonic disc) a tube (shown in orange) extends under the ectoderm in the opposite direction to the primitive streak (shown in grey). | |||
* 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 | |||
** bringing the connecting stalk to the umbilicus | |||
:{{Stage 7 overlays}} | |||
Features: embryonic disc, primitive node, primative streak, primative groove, yolk sac | Features: embryonic disc, primitive node, primative streak, primative groove, yolk sac | ||
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Events: Gastrulation is continuing as cells migrate from the epiblast, continuing to form mesoderm. | Events: Gastrulation is continuing as cells migrate from the epiblast, continuing to form mesoderm. | ||
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* | * Blue dot (top) - buccopharyngeal membrane | ||
* | * Blue dot (middle) - primitive node | ||
* Blue dot (bottom) - cloacal membrane | |||
* Orange line - axial mesoderm (future notochord) | |||
* grey line - primitive streak | |||
: | :[[Carnegie stage 7|Stage 7 Links]]: :[[Carnegie stage 7]] | [[Gastrulation]] | [[Mesoderm]] | ||
|} | |||
{{Stage 7 mesoderm images}} | |||
===Reference=== | |||
Image Source: UNSW Embryology | Image Source: UNSW Embryology | ||
No image reuse without permission. | No image reuse without permission. | ||
Latest revision as of 16:04, 17 August 2014
Carnegie Stage 7 showing the notochord or axial mesoderm region of the embryonic disc
Notochord
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. |
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Reference
Image Source: UNSW Embryology
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