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Trilaminar - Coggle Diagram
Trilaminar
Embryonic Folding
- Assess the process of embryonic folding. When does embryonic folding occur? What does embryonic folding accomplish?
Types of Folding
Longitudinal Folding
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Tail Fold
- Assess which parts of the gut form from which aspect of embryonic folding? Which region of the gut tube remains open to the yolk sac the longest? What structure forms as the connection between the gut tube and the yolk sac becomes more narrow?
Lateral Folding
- Describe lateral folding. How does lateral folding affect the thoraco-abdominal wall and the gut?
- Analyze the clinical aspects related to embryonic folding
Gastrulation
- Outline the steps in the process of gastrulation. What does the process of gastrulation accomplish?
Broad Answer
In Gastrulation the bilaminar embryonic disc is converted into a trilaminar embryonic disc, except for the Buccopharyngeal and cloacal membrane. (epiblast becomes endoderm, mesoderm, and ectoderm; hypoblast degenerates), the primitive streak and notochord form.
The 3 New Layers
- Describe the general derivatives of the endoderm, mesoderm, & ectoderm layers.
Mesoderm
- Compare and contrast the paraxial, intermediate, lateral plate, and cardiogenic mesoderm. Which structures develop from each? Which mesoderm is continuous with extra-embryonic mesoderm? Which space forms within the lateral plate mesoderm?
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Primitive Streak
- Describe the primitive streak & its components. Describe which cells from which layer of the bilaminar embryonic disk migrate through the primitive groove. What three layers do these cells form? What happens to the hypoblast during the process of gastrulation?
- Assess what happens to the primitive streak following gastrulation.
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