Synapse

In the nervous system, a synapse is a structure that allows a neuron to exchange signals with another cell in its immediate vicinity. Synapses can be classified as either chemical or electrical, depending on the mechanism of signal transmission between neurons. In the case of electrical synapses, neurons are coupled bidirectionally with each other through gap junctions and have a connected cytoplasmic milieu.

These types of synapses are known to produce synchronous network activity in the brain, but can also result in complicated, chaotic network level dynamics.
Therefore, signal directionality cannot always be defined across electrical synapses.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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