Definitions for "Synaptic vesicles"
are found in the nerve terminal and contain the neurotransmitter. They fuse with the presynaptic nerve terminal membrane in response to a depolarising input, and by so doing release their neurotransmitter which can then bind to receptors in the postsynaptic (and at some synapses, presynaptic) nerve process X Y Z
Membrane sacs that store neurotransmitter molecules ready for release near the presynaptic membrane.
Vesicles at the synapse end of an axon that contain the neurotransmitters. PICTURE