2010 BGD Practical 3 - Gastrulation: Difference between revisions
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== Stage 7 == | == Stage 7 == | ||
[[File:Stage7_features.jpg|left]] | {| | ||
'''Features:''' embryonic disc, primitive node, primative streak, primitive groove, yolk sac | |- | ||
| [[File:Stage7_features.jpg]] | |||
| [[File:Stage7_primitive_streak_labelled.jpg]] | |||
| [[File:Stage7 axes.jpg]] | |||
| [[File:Stage7 folding.jpg|left]] | |||
|- | |||
| '''Features:''' embryonic disc, primitive node, primative streak, primitive groove, yolk sac | |||
'''Facts:''' Week 3, 15 - 17 days, 0.4 mm | '''Facts:''' Week 3, 15 - 17 days, 0.4 mm | ||
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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. | 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. | ||
'''Gastrulation:''' Through the '''primitive streak '''cells migrate continuously through week 3 into week 4. Initial cells replace hypoblast as an epithelial layer the '''endoderm'''. Later migrating cells spread between the two epithelial layers to form '''mesoderm'''. | | '''Gastrulation:''' Through the '''primitive streak '''cells migrate continuously through week 3 into week 4. Initial cells replace hypoblast as an epithelial layer the '''endoderm'''. Later migrating cells spread between the two epithelial layers to form '''mesoderm'''. | ||
| '''Axes:''' embryonic disc is shown rostral (head) to top and caudal (tail) to bottom. Left and right are the lateral margins of the disc as shown. | |||
'''Axes:''' embryonic disc is shown rostral (head) to top and caudal (tail) to bottom. Left and right are the lateral margins of the disc as shown. | |||
| '''Folding:''' all edges of the embryonic disc will fold ventrally, forming a rostro-caudal "C" shaped tube. | |||
'''Folding:''' all edges of the embryonic disc will fold ventrally, forming a rostro-caudal "C" shaped tube. | |||
|- | |||
|} | |||
==Movies== | ==Movies== |
Revision as of 20:54, 9 May 2010
Practical 3: Oogenesis and Ovulation | Gametogenesis | Fertilization | Early Cell Division | Week 1 | Implantation | Week 2 | Extraembryonic Spaces | Gastrulation | Notochord | Week 3 | Quiz
Introduction
Gastrulation
Carnegie Stage 7 and 8, gastrulation, migration of cells through the primitive streak to form endoderm and mesodermal layers of embryo.
Scanning electron micrograph through the streak region showing the early forming 3 layers: ectoderm, mesoderm and endoderm.
Stage 7
Movies
Implantation | Mesoderm | Chorionic Cavity | Amniotic Cavity | Week 3 |
Practical 3: Oogenesis and Ovulation | Gametogenesis | Fertilization | Early Cell Division | Week 1 | Implantation | Week 2 | Extraembryonic Spaces | Gastrulation | Notochord | Week 3 | Quiz
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
- 2010 BGD: Lecture 1 | Lecture 2 | Practical 3 | Practical 6 | Practical 12
Cite this page: Hill, M.A. (2024, April 24) Embryology 2010 BGD Practical 3 - Gastrulation. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/2010_BGD_Practical_3_-_Gastrulation
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G