 The brain and spinal cord: The brain is the most important component of the nervous system and is the central part. It controls all body functions by receiving input from the sensory organs (eyes, nose, mouth, skin and ears.) The spinal cord is a large bundle of tissue that stretches from the lower part of the brain and separates into individual root nerves once it reaches the lumbar region of the spine.
 Nerves and nerve endings: nerves are bundles of fibre that transmit impulse sensations to the brain and spinal cord. The nerve endings are the structure at the end of a nerve.
 The purpose of the nervous system is to control the bodies functions. The two systems work together in order to collect information from in and outside