The spinal nerves of the lower back also carry many neurons of the autonomic nervous system (ANS) that maintain the vital involuntary processes of the digestive, urinary, endocrine, and reproductive systems.
Spinal Nerves. Here is more information about your nerves, spine and back: The nervous system is divided into two systems. The Central Nervous System which is the brain and the spinal cord, and the Peripheral Nervous System which is the 12 cranial nerves, 31 pairs of spinal nerves and ganglia.
How Nerves Cause Pain. Spinal structures and nerves are in close proximity, creating the potential for irritation and pressure on the nerves. Many structures in the spine can cause back pain, such as when: Large nerve roots that go to the legs and arms are irritated.