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Questions and Answers
During which week of embryonic development does gastrulation occur?
During which week of embryonic development does gastrulation occur?
- Fifth week
- Fourth week
- Second week
- Third week (correct)
What is the process by which cells migrate from the embryoblast to form the germ layers during gastrulation?
What is the process by which cells migrate from the embryoblast to form the germ layers during gastrulation?
- Morphogenesis
- Invagination
- Epiboly
- Delamination (correct)
What is the process by which tissues differentiate into specific cell types during organogenesis?
What is the process by which tissues differentiate into specific cell types during organogenesis?
- Gastrulation
- Morphogenesis
- Histogenesis (correct)
- Organ induction
During which weeks of embryonic development does organogenesis occur?
During which weeks of embryonic development does organogenesis occur?
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What is the result of the gastrulation process?
What is the result of the gastrulation process?
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What is the process by which one tissue influences the development of another during organogenesis?
What is the process by which one tissue influences the development of another during organogenesis?
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Study Notes
Embryonic Development
Gastrulation
- Definition: The process by which the blastula undergoes a series of complex cellular movements to form the three primary germ layers: ectoderm, mesoderm, and endoderm
- Occurs during the third week of embryonic development
- Characterized by:
- Invagination: inward movement of cells to form the archenteron (primitive gut)
- Delamination: migration of cells from the embryoblast to form the germ layers
- Epiboly: expansion of the embryoblast to cover the yolk sac
- Results in the formation of the gastrula, consisting of the three primary germ layers
Organogenesis
- Definition: The process by which the three primary germ layers differentiate and organize to form specific organs and body systems
- Occurs during the fourth to eighth weeks of embryonic development
- Characterized by:
- Morphogenesis: the process by which tissues and organs take shape
- Histogenesis: the process by which tissues differentiate into specific cell types
- Organ induction: the process by which one tissue influences the development of another
- Results in the formation of major organs and body systems, such as the nervous system, circulatory system, and digestive system
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