GO:0042135

neurotransmitter catabolic process

Details: 
The chemical reactions and pathways resulting in the breakdown of any of a group of substances that are released on excitation from the axon terminal of a presynaptic neuron of the central or peripheral nervous system and travel across the synaptic cleft to either excite or inhibit the target cell. [CHEBI:25512, GOC:jl]
Evidence Code: