Neurulação (em português) - Terceira semana do desenvolvimento embrionário

Summary

The process of neurulation begins with the formation of the neural plate, which thickens and grows at the cranial end of the embryo, eventually giving rise to the brain and spinal cord. As the neural plate folds, it creates the neural groove, and the neural tube forms. The fusion of the neural tube progresses from the middle outward, while cells at the crest of the neural folds detach to form the neural crest, contributing to the peripheral nervous system. By the end of the third week, when the neural tube is fully fused, the neurulation process is complete.

Takeaways

• 😀 The first event of neural development is the formation of a thickened area of cells called the neural plate.
• 😀 The neural plate forms at the cranial end of the embryo and grows in a cranial-caudal direction.
• 😀 The cranial or head end of the neural plate will develop into the future brain, while the caudal or tail end forms the future spinal cord.
• 😀 By the end of the third week of development, the lateral edges of the neural plate elevate and form the neural folds.
• 😀 The space created by the folding of the neural plate is called the neural groove.
• 😀 The neural folds fuse together to form the neural tube, which is the precursor to the central nervous system.
• 😀 Fusion of the neural tube begins in the middle of the embryo and extends in both cranial and caudal directions.
• 😀 The closure of the neural tube marks the completion of neural tube formation.
• 😀 Cells at the crest of the neural fold detach and form the neural crest, a new population of cells.
• 😀 The neural crest cells contribute to the formation of the peripheral nervous system.
• 😀 The process of neuralation is complete once the neural tube has fully fused.

Q & A

What is the first event of neurulation?

The first event of neurulation is the formation of a thickened area of cells, known as the neural plate.

Where does the neural plate form in the embryo?

The neural plate forms at the cranial end of the embryo and grows in a cranial-caudal direction.

What does the cranial end of the neural plate represent?

The cranial end of the neural plate indicates the future region of the brain.

What does the caudal end of the neural plate represent?

The caudal end of the neural plate represents the future region of the spinal cord.

What happens to the lateral edges of the neural plate by the end of the third week?

By the end of the third week, the lateral edges of the neural plate become elevated and move together to form the neural folds.

What is the neural groove?

The neural groove is the space created by the folding of the neural plate.

What occurs during the fusion of the neural folds?

During the fusion of the neural folds, the neural plate transforms into the neural tube, which is the precursor to the central nervous system.

Where does the fusion of the neural tube usually begin?

Fusion of the neural tube usually begins in the middle of the embryo and extends in both cranial and caudal directions.

What are the neural crest cells and what is their role?

The neural crest cells are formed when cells on the crest of the neural fold detach. These cells contribute to the formation of the peripheral nervous system.

When is the process of neurulation considered complete?

The process of neurulation is considered complete once the neural tube has fully fused.