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- 11:22, 31 January 2023 Nikolas talk contribs created page 19. The placodes, the neural crest and their derivatives. Development of the peripheral nervous system (Created page with "== Learning objectives == * What is a placode? * Name all placodes and their derivatives * What is the neural crest? * What structures and cells do neural crest cells give rise to? * Describe the development of the peripheral nervous system == The placodes == A placode is a thickening of ectoderm which develops into a sensory organ or ganglion. There are multiple placodes, all of which are paired. === Lens placode === The lens placodes, also called the optic placodes,...") Tag: Visual edit