Identify the given structure given. 
Definitions:
Endoneurium
The thin layer of connective tissue that surrounds individual nerve fibers within a nerve.
Synapse
The junction between two neurons or between a neuron and a muscle where communication occurs through neurotransmitter release.
Chloride Channels
Chloride channels are membrane proteins that allow the passive movement of chloride ions across cell membranes, influencing various physiological processes.
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