develops from neural tube 神经管 In the developing vertebrate, 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 a closed tube, the neural tube or neural canal (which strictly speaking is the center of the neural tube), the ectodermal wall of which forms the rudiment of the nervous system. [WP,unvetted]. neural primordium presumptive central nervous system tubus neuralis 主干管 在发育中的脊椎动物中，神经管是中枢神经系统的胚胎前体，其包含脑和脊髓。随着神经褶皱的升高，神经沟逐渐加深，最终褶皱在中线汇合，并将褶皱转化为一个封闭管、神经管或神经沟（严格来说是神经管的中心） ，其外胚层壁形成了神经系统的雏形。 [WP，未经审查]。 推定的中枢神经系统 神经原基 epithelial tube 上皮管 neural rod 神经棒 embryonic tissue 胚胎组织 ecto-epithelium 外胚上皮 future central nervous system 原中枢神经系统