What Is a Brain Pathway?
A brain pathway (or neuronal pathway) is like a power line between two brain regions. A brain pathway is made up of interconnected neurons, and signals travel along them from one area of the brain to another.
Neurotransmitters are molecules that allow a signal to travel from one neuron to another. All drugs of abuse interfere with neurotransmitter signaling in some way. Neurons in different brain pathways use different neurotransmitters. Depending on which neurotransmitters they interfere with, drugs have varied effects in the brain.