IAS (Admin.) Mains Zoology Developmental Biology-Differentiation from Gamete to Neurula Stage Study Material (Page 1 of 5)
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Introduction to Embryogenesis: Step 1 to 4
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- Embryogenesis, the first eight weeks of development after fertilization, is an incredibly complicated process.
- it՚s amazing that in eight weeks we՚re transforming from a single cell to an organism with a multi-level body plan.
- The circulatory, excretory, and neurologic systems all begin to develop during this stage.
- Luckily, like with many complex biological concepts, fertilization can be broken down into smaller, simpler ideas.
- The big idea of embryogenesis is going from a single cell to a …
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Introduction to Embryogenesis: Step 5 - Making Tubes
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Step 5
- During gastrulation the three germ layers form; the cell mass is now known as a gastrula
Step 5 A
- The primitive streak forms
Step 5b
- The notochord is formed
- Week 3 of development is the week of gastrulation into germ layers.
- A germ layer is a layer of cells that will go on to form one of our organizational tubes. Our anatomy can really be boiled down to an inner tube (our digestive tract) , and a series of tubes that wrap around it.
The Three Germ Layers That Will Translate into These Tubes Are the Ectoderm, the Mesoderm, and the Endoderm
Ectoderm
- Outer, external layer
- Epidermis (outer l…
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