Buton so bouton is simply a medical term that refers to a knob like swelling, like the structure shown here. So basically, this entire diagram describes something called the synapse. The synapse includes our neuron that is sending that signal. It includes the space known as our synaptic cleft. And it also includes our cell that is receiving that signal. And basically, this is our system that allows for the transmission of the electrical signal from one cell to the other cell.