Ectoderm(外胚层)- Neurulation Overlying notochord Antenor neuropore Thickens- Neural plate (神经板) Otic placode eDges- Neural Folds (神经褶) ut edge of amnio Fuse at future neck region p i2 da B Posterior dromore 23 days Zippers shut - Neural Tube(神经管) ●Ant/ Post Neuropores (前/后神经孔) NotochordEctoderm （外胚层）- Neuralation •Overlying notochord Thickens – Neural Plate （神经板） •Edges - Neural Folds （神经褶） •Fuse at future neck region •Zippers shut –Neural Tube（神经管） •Ant/Post Neuropores （前/后神经孔）