Synaptic vesicle

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noun, plural: synaptic vesicles

(neurobiology) Any of the intracellular, membrane-bound compartments with diameter ranging from 20 to 65 nm, with transmitter molecules inside, and occur in (presynaptic) axon terminals of neuron,


The synaptic vesicles take and store neurotransmitters. When an action potential reaches the axon terminal, the synaptic vesicle fuses its membrane with the presynaptic membrane of the axon terminal to release the neurotransmitter at the synapse.