Vesicles that store neurotransmitters are located at the presynaptic terminal of a neuron.

Here's a breakdown:

* Neuron: A nerve cell responsible for transmitting information throughout the nervous system.

* Presynaptic terminal: The end of a neuron's axon (the long, slender projection of a neuron) where it communicates with another neuron or target cell.

* Synapse: The junction between two neurons or a neuron and a target cell.

* Neurotransmitter: A chemical messenger that transmits signals across the synapse.

When a neuron is stimulated, the vesicles containing neurotransmitters fuse with the presynaptic membrane and release their contents into the synaptic cleft. This triggers a response in the receiving neuron or target cell.