They are stored in synaptic vesicles.
Where are chemical messengers kept on the presynaptic membrane before they cross the synapse to connect with receptors on the postsynaptic membrane?
Neurotransmitters come in a wide variety, and more are always being found! The very definition of what constitutes a neurotransmitter has evolved and grown throughout time. We'll discuss these unconventional neurotransmitters at the end of the article, but for now, let's start out by talking about the conventional ones. The chemical messengers that act as conventional neurotransmitters share some basic features. They are stored in synaptic vesicles, get released when textCa2+Ca increases in the synaptic cleft, and are released from synaptic receptors.
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