15 Questions
During which period does organogenesis occur?
Third to eighth weeks
What is the process of formation of the shape of the embryo called?
Morphogenesis
When do the main organ systems become established?
End of the second month
What induces the overlying ectoderm to thicken and form the neural plate?
Appearance of notochord and prechordal mesoderm
What represents the initial event in the process of neurulation?
Induction of neuroectoderm cells
When are the majority of birth defects induced according to the text?
Third to eighth weeks
What is the result of the fusion of neural folds in the cervical region?
Formation of the neural tube
When does the closure of the cranial neuropore occur?
Approximately day 25
What are the derivatives of the mesodermal germ layer?
Paraxial mesoderm and lateral plate mesoderm
What is the most common site for spina bifida?
Lumbosacral region
What do neural crest cells dissociate from?
Lateral border of the neuroectoderm
What represents the closed tubular structure of the central nervous system?
Neural tube
What is neurulation?
Process of neural tube formation
What can prevent 50%-70% of cases of neural tube defects (NTDs)?
$400$ micrograms supplementation of folic acid three months prior to conception & continuing throughout pregnancy
What is the function of mesenchyme in relation to neural crest cells?
Undergoes epithelial to mesenchymal transition.
Test your knowledge on the embryonic period, which occurs from the third to the eighth weeks of development. Learn about organogenesis and morphogenesis, as well as the establishment of main organ systems.
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