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Four neural tube subdivisions each eventually develop into distinct regions of the central nervous system by the division of neuroepithelial cells: the forebrain (prosencephalon), the midbrain (mesencephalon), the hindbrain (rhombencephalon) and the spinal cord.
For a short time, the neural tube is open both cranially and caudally.
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(Neural tube is in green.) In the developing chordate (including vertebrates), the neural tube is the embryo's precursor to the central nervous system, which comprises the brain and spinal cord.
The neural groove gradually deepens as the neural folds become elevated, and ultimately the folds meet and coalesce in the middle line and convert the groove into the closed neural tube.
The edges of the neural plate start to thicken and lift upward, forming the neural folds.
The center of the neural plate remains grounded, allowing a U-shaped neural groove to form.
Retinoic acid is required ventrally along with Shh to induce Pax6 and Olig2 during differentiation of motor neurons.
Three main ventral cell types are established during early neural tube development: the floor plate cells, which form at the ventral midline during the neural fold stage; as well as the more dorsally located motor neurons and interneurons.
These openings, called neuropores, close during the fourth week in humans.