From Fertilisation to Gastrulation
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Work in progress, expect frequent changes. Help and feedback is welcome. See discussion page. |
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Contents
Preknowledge, Objectives and Competencies
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In this unit we will review the processes that lead from fertilisation to the implantation of the embryo. We will build on our prior knowledge and examine in detail the process of gastrulation and the early formation of the germ layers that will give rise to the adult tissues. Special emphasis will be placed on those structures that will have a direct effect on the development and formation of the nervous system |
At the end of this unit you should be able to:
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Activities and Reading Material
| During class, we will use the diagrams provided in the lecture notes to identify and label the different structures and use those as a platform to discuss the early processes of development
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- Purves et al., Chapter 22 (pp. 542-547)
- Jacobsen Chapter 1 (Sections: 'The Xenopus embryo' and 'The mouse embryo')
Assignments
| After class, you are expected to review your notes and read the assigned text material. You are expected to contribute to the questions and definitions sections below. Please use the discussion page if you want to discuss any particular topic on the material. You are also welcome to add links to videos or audio files in the Media box or links to online resources in the Web Resources box below. |
Questions
| How would you describe the differences between amphibian and mammalian gastrulation? |
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| What do amphibian and mammalian gastrulation have in common? |
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| Cells migrate through different streaks under the ectoderm to give rise to different structures. Can you name these structures and describe how cells migrate to form them? |
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Definitions
You should be able to provide structural and functional definitions for the structures associated with this topic:
(blastocyst, gastrula, inner cell mass, epiblast, hypoblast, cellular trophoblast, syncitial trophoblast, amniotic cavity, yolk sac, blastocoel, primitive streak, node (aka Hensen's node), prechordal mesoderm, chordomesoderm (notochord)).
| Blastocyst: |
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| Gastrula: |
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| Inner Cell Mass: |
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| Epiblast: |
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| Hypoblast: |
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| Cellular Trophoblast: |
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| Syncitial Trophoblast: |
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| Amniotic Cavity: |
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| Yolk Sac: |
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| Blastocoel: |
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| Primitive Streak: |
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| Node (a.k.a. Hensen's Node): |
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| Prechordal Mesoderm: |
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| Chordal Mesoderm (Notochord): |
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Additional study material
For Illustration
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Related Content
Go back to the introductory page Continue with Unit 2 (Specification and Differentiation of Tissues)
