Contact: Address: Brooklyn, NY 11214 Phone: 646-647-8696 About US: Sympathetic nerves run on the front surface of the spinal column and not inside the spinal canal, like the nerves that provide sensation and strength to the legs. These nerves are part of the autonomic nervous system, which controls functions such as blood flow and temperature regulation to the arms and legs, sweating, heart rate, digestion, and blood pressure, among others.