What are nerves?

Nerves are made of soft tissue cables that exit the spinal cord as nerve roots, and travel to the extremity or trunk. They convey information to and from the brain. Sensory nerves carry information regarding sensation to the spinal cord and brain. Motor nerves carry electric impulses from the brain through the spinal cord, terminating in a muscle. Muscles contract as the result of chemical and electrical impulses generated through a peripheral nerve.