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Questions and Answers
During which stage of embryonic development does the primitiva line become visible?
Which factor controls the formation of the nota gorda from the notochord?
Which germinal layer undergoes a process called induction and forms the mesoderm?
What does the endoderm form during the second germinal layer stage?
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Which region of the embryo contains pluripotent cells capable of generating all tissues, including cardiac and neural tissue?
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What does the ectoderm form apart from the neural plate and the central nervous system?
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Study Notes
- Video discusses Chapter 5 of a biology course about the third stage of embryonic development, specifically the germinal disc.
- Formation of the primitiva line, visible from day 15 or 16, located at the cephalic end of the embryo.
- Presence of notochord, which forms the nota gorda, controlled by the factor of growth of fibroblasts 8.
- Cells from the first germinal layer, the epiblast, undergo a process called induction and form the mesoderm of the second germinal layer.
- Formation of the endoderm, which forms the endodermal plate, also occurs during the second germinal layer stage.
- The third germinal layer is the ectoderm, which forms the ectodermal plate.
- Establishment of the body axes, with the anterior and posterior axes forming the anterior and posterior body regions, respectively.
- Formation of the dorsal and ventral axes, with the dorsal axis forming the dorsal midline and the ventral axis forming the ventral midline.
- The ectoderm forms the neural plate, which eventually forms the neural tube and the central nervous system.
- The ectoderm also forms the epidermis and the mesoderm forms the muscle, bone, and connective tissue.
- The pluripotent cells in the embryo, located in the sacrococcygeal region, can generate all the tissues of the embryo, including cardiac and neural tissue.
- Defects in lateralization, such as situs inversus or congenital heart disease, can occur due to abnormalities in the position of the embryo or the closure of the neural tube.
- The role of the amniotic sac in protecting the embryo and facilitating its development is also discussed.
- The third week of embryo development is the most sensitive to external influences, making it important for the mother to avoid alcohol and teratogenic drugs.
- The fourth week marks the disappearance of the primitive streak and the formation of the definitive layers of the embryo.
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Description
Test your knowledge on the third stage of embryonic development, covering topics like germinal disc, primitiva line formation, notochord, germinal layers, body axes establishment, ectoderm and mesoderm formation, and the role of amniotic sac. Explore the sensitivity of the third week and the events in the fourth week of embryo development.
