Now, on the other hand, the peripheral nervous system consists of everything else, of everything outside of the brain and the spinal cord and it does not contain any interneurons. The only type of neurons this system contains are motor neurons and sensory neurons. And we'll see what those are in just a moment. Now, we can subdivide the peripheral nervous system into the somatic nervous system and the autonomic nervous system. Now, within the autonomic nervous system we have special type of motor and sensory neurons known as pre ganglionic neurons and post ganglionic neurons. Now, the autonomic system can be divided into the sympathetic and the parasympathetic system.