Which of the following is NOT one of the main dopaminergic pathways?

• A. Serotonergic Pathway
• B. Nigrostriatal Pathway
• C. Mesocorticolimbic Pathway
• D. All are main dopaminergic pathways

Answer: (A)

The main concept here is recognizing which brain pathways use dopamine versus another neurotransmitter. Dopaminergic pathways include the nigrostriatal tract, which runs from the substantia nigra to the striatum and is essential for movement control, and the mesocorticolimbic system, which originates in the ventral tegmental area and projects to limbic regions and the prefrontal cortex to support reward, motivation, and cognition. A serotonergic pathway uses serotonin, not dopamine, so it’s not part of the dopaminergic system. That’s why the serotonergic pathway is the correct answer: it is not one of the main dopaminergic pathways. The other two options listed are, in fact, dopaminergic pathways, and the statement that all are dopaminergic is therefore false.