And then that action potential somehow moves along the axon and all the way to the axon terminal, away from the soma of the neuron. Now the question is, how exactly does our action potential actually travel along the exxon? And why does our action potential only move in this direction, away from our soma? So let's begin by zooming in onto our exxon hilloc, as shown in the following diagram. So this is before any stimulus is actually applied. So before we apply our stimulus, the inner portion of the cell membrane.