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Red: General visceral afferents from IX and X. Blue: Preganglionic parasympathetic efferents. Green: The solitary nucleus sends excitatory input to the dorsal vagal nucleus that increases parasympathetic outflow to the heart, resulting in bradycardia. It also sends inhibitory input to the rostral ventrolateral medulla, reducing firing in the intermediolateral cell column of the spinal cord, reducing sympathetic outflow to the blood vessels and causing associated vasodilatation.
