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15 Questions

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Embryonic Period Development Quiz

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Questions and Answers

During which period does organogenesis occur?

Eighth to twelfth weeks

Third to eighth weeks (correct)

Twelfth to sixteenth weeks

First to third weeks

What is the process of formation of the shape of the embryo called?

Differentiation

Cephalization

Morphogenesis (correct)

Neurulation

When do the main organ systems become established?

End of the fourth month

End of the third month

End of the first month

End of the second month (correct)

What induces the overlying ectoderm to thicken and form the neural plate?

Appearance of notochord and prechordal mesoderm Signup and view all the answers

What represents the initial event in the process of neurulation?

Induction of neuroectoderm cells Signup and view all the answers

When are the majority of birth defects induced according to the text?

Third to eighth weeks Signup and view all the answers

What is the result of the fusion of neural folds in the cervical region?

Formation of the neural tube Signup and view all the answers

When does the closure of the cranial neuropore occur?

Approximately day 25 Signup and view all the answers

What are the derivatives of the mesodermal germ layer?

Paraxial mesoderm and lateral plate mesoderm Signup and view all the answers

What is the most common site for spina bifida?

Lumbosacral region Signup and view all the answers

What do neural crest cells dissociate from?

Lateral border of the neuroectoderm Signup and view all the answers

What represents the closed tubular structure of the central nervous system?

Neural tube Signup and view all the answers

What is neurulation?

Process of neural tube formation Signup and view all the answers

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 Signup and view all the answers

What is the function of mesenchyme in relation to neural crest cells?

Undergoes epithelial to mesenchymal transition. Signup and view all the answers