A chemical compound which causes the transmission of nerve impulses at nerve junctions (synapses).

a substance sending nerve impulses across a synapse.

A chemical released from the pre-synaptic terminus of an axon that diffuses across the synapse and binds to receptors in the post-synaptic membrane. Neurotransmitters are released from synaptic vesicles near the presynaptic cell membrane in response to th

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.