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Cervical spinal stenosis is the narrowing of the spinal canal in the neck. The spinal canal is the open area in the bones (vertebrae) that make up the spinal column. The spinal cord is a collection of nerves that runs through the spinal canal from the base of the brain to the lower back. These nerves allow us to feel, to move, and to control the bowel and bladder and other body functions.
Motor nerves. Motor nerves (motor neurons) pass information received from your brain through your spinal tracts to your skeletal muscles to direct precise voluntary movements. Spinal nerves are linked to specific muscles: 1  Cervical spinal nerves supply the muscles of your neck, shoulders, arms and hands, and diaphragm. 2  Thoracic spinal nerves supply your truck muscles and muscles involved with breathing. 3  Lumbar and sacral spinal nerves supply your hip, leg and foot muscles.