Question

During closure of neural folds, the neural crest cells form from neuroectoderm. What is the correct sequence of events during this process?

1) Neuroectoderm thickens and forms neural folds. Neural crest cells form from the neuroectoderm.
2) Neural crest cells form from the neuroectoderm. Neuroectoderm thickens and forms neural folds.
3) Neural crest cells form from the neuroectoderm. Neural folds form from the thickened neuroectoderm.
4) Neural folds form from the thickened neuroectoderm. Neural crest cells form from the neuroectoderm.

Answer 1

The correct sequence of events during the closure of neural folds and formation of neural crest cells is: neuroectoderm thickens and forms neural folds, neural folds form from the thickened neuroectoderm, and neural crest cells form from the neuroectoderm.

Step-by-step explanation:

The correct sequence of events during the closure of neural folds and formation of neural crest cells is:

1. Neuroectoderm thickens and forms neural folds.
2. Neural folds form from the thickened neuroectoderm.
3. Neural crest cells form from the neuroectoderm.

During development, the neuroectoderm differentiates into the neuroepithelium, forming a neural plate. The neural folds then form from the thickened neuroectoderm. Finally, neural crest cells separate from the neuroectoderm and migrate away to form various structures in the peripheral nervous system.