And what these cells do is they move around the axon of the neuron and they basically cover that neuron at specific sections with a layer of insulating myelin. Now, because the myelin is insulating, what that means is no action potential can actually be generated on the cell membrane where it is covered with that myelin material. Now, just because the cell membrane is actually covered with that myelin material, that does not mean that no electric signal can travel through that axon. In fact, even though this section, let's say this section of the axon is covered with the myelin, our electric current can still travel through the cytoplasm to the cytosol of our cell and that's exactly how that signal will get from one node to the next node as we'll see in just a moment. So instead, the current moves through the cytosol of the axon until it reaches a part of the membrane that is not myelinated. And these gaps where we do not have any myelination as shown on this diagram and this diagram, so these are the gaps and these are the gaps here.