Ephaptic coupling is a form of communication within the
nervous system and is distinct from direct communication systems like
electrical synapses and
chemical synapses. It may refer to the coupling of adjacent (touching) nerve fibers caused by the exchange of ions between the cells, or it may refer to coupling of nerve fibers as a result of local electric fields. In either case ephaptic coupling can influence the synchronization and timing of
action potential firing in neurons.
Myelination is thought to inhibit ephaptic interactions.