The embryonic neural tube's lumen serves as the source for the brain's ventricles.
In the vertebrate embryo, the opposing ectodermal folds infold and then fuse to form neural tubes, which are the hollow longitudinal dorsal tubes that give rise to the brain and spinal cord. The central nervous system, including the brain and spinal cord, develops in the neural tube. Congenital malformations including neural tube defects might result from mistakes in this process. The neural fold is formed by folding towards the midline of the embryo, which further fuses together to give rise to neural tubes.
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