Question

Which structure serves as the early central nervous system?

Answer 1

The early central nervous system develops from a simple, hollow tube known as the neural tube. This tube runs from the anterior end of the embryo to the posterior end.

Step-by-step explanation:

The early central nervous system develops from a simple, hollow tube known as the neural tube. This tube runs from the anterior end of the embryo to the posterior end. As development progresses, the anterior end of the neural tube forms the brain, while the posterior portion becomes the spinal cord. This basic arrangement of tissue gives rise to more complex structures by the fourth week of development.