neural plate 神经板 A region of embryonic ectodermal cells that lie directly above the notochord. During neurulation, they change shape and produce an infolding of the neural plate (the neural fold) that then seals to form the neural tube[XAO]. The earliest recognizable dorsal ectodermal primordium of the central nervous system present near the end of gastrulation before infolding to form the neural keel; consists of a thickened pseudostratified epithelium[ZFA] lamina neuralis presumptive central nervous system 位于脊索正上方的胚胎外胚层细胞区域。在神经胚形成过程中，它们发生形态改变并产生一个神经板（神经折叠）的折叠，然后封闭形成神经管[XAO]。中枢神经系统最早的可识别的背外胚层原基出现在原肠胚形成邻近结束的时候，在形成神经龙骨之前；由增厚的假复层上皮组成[ZFA] 推定的中枢神经系统 髓层 embryonic tissue 胚胎组织 ecto-epithelium 外胚上皮 future central nervous system 原中枢神经系统