How does the human nervous system develop?

The human nervous system develops from a small, specialized plate of cells along the back of an embryo. Early in development, the edges of this plate begin to curl up toward each other, creating the neural tube-a narrow sheath that closes to form the brain and spinal cord of the embryo. As development progresses, the top of the tube forms the brain, while the remainder forms the spinal cord. This process is usually complete by the 28th day of pregnancy. However, problems occurring during this process can result in brain disorders called neural tube defects, which include spina bifida.

This answer is based on source information from the National Institute of Neurological Disorders and Stroke.

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