Neural tube

（重定向自Neural canal）

Shh secreted from the floor plate creates a gradient along the ventral neural tube. Shh functions in a concentration-dependent manner to specify ventral neuronal fates. V0-V3 represent four different classes of ventral interneurons, and MN indicates motor neurons.

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 ectodermal wall of the tube forms the rudiment of the nervous system. The centre of the tube is the neural canal.

单词	Neural canal
释义	Neural canal 英语百科 Neural tube （重定向自Neural canal） 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 ectodermal wall of the tube forms the rudiment of the nervous system. The centre of the tube is the neural canal.
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