Now, what about interneurons? Well, intraneurons are basically simply those neurons that connect other neurons to one another. For example, we can have an inter neuron that connects a sensory to a motor neuron as we'll see in just a moment in our example of the simple reflex arc. Now let's define what a nucleus is with respect to the nervous system. So the nucleus here doesn't actually refer to the individual nucleus inside the cell body of our neuronuron. So the nucleus refers to a collection of many neurons of many cell bodies found within the central nervous system.