Ectoderm- Neural crest eAs neural tube closes Neural crest(神经嵴) ● Detach and migrate neural crest PNS Melanocytes - skin A Notochord Neural told Neural groove 肾上腺髓质 Intermediate zone Surface neural crest Dorsal root ectoderm Neural tubeEctoderm – Neural Crest •As neural tube closes -Neural crest （神经嵴） •Detach and migrate –PNS –Melanocytes – skin –肾上腺髓质