This is also how messages get from your body back to your brain and spinal cord. For example, if you step on something sharp, the nerves in your foot send a message through neurons to your central ...

The peripheral nervous system (PNS) is the system of nerves and ganglia outside the brain and spinal cord. The PNS consists of the peripheral nerves, neuromuscular junctions, cranial nerves, and ...

The sympathetic nervous system, which helps your heart and other vital organs function all the time, increases activity in response to danger or stress, preparing the body for extra demands. Stress is ...