The human nervous system is a complex and fascinating part of the body composed of a network of specialized cells that transmit signals and coordinate actions. This complex network includes the brain, spinal cord and nerves and contains an estimated 100 billion to one trillion neurons!
The nervous system is divided into two main parts: the central nervous system and the peripheral nervous system. The central nervous system including the brain and spinal cord and processes every sensation, thought, feeling and action that you experience. The peripheral nervous system includes all of the nerves that are located outside of the brain and spinal cord. This part of the nervous system control automatic functions such as the heartbeat and blood pressure as well as carrying information to and from the central nervous system.
When performing even the simplest action, like curling your fingers to clutch a pencil or typing words on your computer keyboard, these two part of the nervous system must function together as a coordinated unit.
Learn more more about the different parts of the nervous system and how each element functions:
Image from the Wikimedia Commons