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The caudal group serotonin pathway refers to a subset of pathways in the brain involving neurons that synthesize and release the neurotransmitter serotonin (5-hydroxytryptamine, 5-HT). These pathways are characterized by their origin in the caudal (posterior) part of the brainstem, particularly in specific nuclei known as raphe nuclei. The caudal group includes the nucleus raphe magnus (cell group B3), the nucleus raphe obscurus (cell group B2), the nucleus raphe pallidus (cell group B1), and the lateral medullary reticular formation.
The neurons in these caudal raphe nuclei project their axons to the [spinal cord](brain:…