Four Roads for One Molecule: Mapping the Brain's Dopamine Pathways

Dopamine doesn't run on a single track — it moves through four distinct pathways in the brain, and each one produces a very different story when its activity shifts. This episode breaks down the mesolimbic, mesocortical, nigrostriatal, and tuberoinfundibular pathways, connecting each to the specific symptoms and medication side effects it produces when dopamine runs too high or too low. We walk through how these circuits explain everything from reward and motivation to movement control and hormone regulation. By the end, you'll be able to work backward from a real-world symptom picture and identify exactly which dopamine pathway is driving it.