We have specific types of receptors, pressure receptors that basically take that pressure and create and transform that pressure into an electrical signal. And that electrical signal is picked up by the sensory neuron. Remember, the sensory neuron is our neuron known as the African neuron that picks up the signal that comes from the environment by that receptor and sends it into the central nervous system. So this is our spinal cord. Now, the spinal cord has a backside, the dolphin side. It has a front side, the ventral side.