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presynaptic
This term is a specialized technical adjective used almost exclusively within the fields of neuroscience, biology, and pharmacology. It describes the side of a chemical synapse that sends the signal, specifically the axon terminal of the sending neuron. It is the direct anatomical opposite of postsynaptic.
Because it is a descriptive scientific term, it lacks emotional connotation or register variation; it is always formal and objective. It typically modifies nouns such as membrane, terminal, vesicle, or potential to specify the exact location of a biological process.
Meanings
Examples
The presynaptic membrane releases neurotransmitters into the synaptic cleft.
Look at the diagram to see where the presynaptic terminal is located.
I wonder if this drug affects the presynaptic receptors or the postsynaptic ones.
Calcium ions enter the presynaptic terminal to trigger vesicle fusion.
The signal originates in the presynaptic neuron before crossing the gap.
Wait, does the presynaptic inhibition happen before or after the action potential reaches the end?
Certain toxins block the release of chemicals from the presynaptic membrane.
The presynaptic vesicle contains a high concentration of glutamate.
The presynaptic vesicle contains a high concentration of glutamate.