Your nerve system is an extensive network that channels nerve impulses from your brain to virtually every cell that makes up your body. This chart shows some of the integral relationships between the spine, nervous system and the body.
Neurons have different shapes depending on their functions. Interneurons carry information between motor and sensory neurons. Sensory neurons carry information to the central nervous system. Motoneurons carry signals from the central nervous system to the muscles, skin, and glands and pyramidal neurons are involved with motor control and cognitive ability. http://health.howstuffworks.com/human-body/systems/nervous-system/brain-pictures24.htm