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the fourth and sixth pharyngeal arches, which give rise to muscles involved in swallowing and speaking. Around weeks 5 to 6, specialized nuclei in the brainstem develop to manage the nerve's motor and sensory functions. These centers are essential for regulating vital automatic processes like breathing, digestion, and heart rate. Between weeks 6 and 9, the vagus nerve extends its branches to various organs, including the heart, lungs, and gastrointestinal tract, as well as sensory areas like the ear and

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