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division originates from the cranial neural crest. The development of the vagus nerve begins early in embryonic life, around the third to fourth week of gestation. It forms from two key structures: neural crest cells, which contribute to its sensory components, and the neural tube, which forms its motor components in the brainstem (specifically in the medulla oblongata). By weeks 4 to 5, the vagus nerve begins to connect with

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