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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.
The L4 nerve is located in the lower back. Photo Credit Comstock Images/Comstock/Getty Images. Your spinal cord is the long bundle of nervous tissue and bones that relay messages between your brain and body. Nearly all muscular movement in the body is facilitated by these messages carried by the nerve cells. A severe injury to the spinal cord can therefore greatly hamper movement or prevent it altogether. In the lower body, it may prevent walking, swimming and all other types of movements performed with the legs.