Severe shock or impact to the spine can result in damage to the neurons forming the spinal cord. Spinal cord injury can impair control of motor capabilities and other bodily function. Unlike nerve fibres in other parts of our body, spinal cord neurons do not have a natural ability to regrow if they are cut or damaged. Spinal cord neurons will not repair themselves, unless aided. Research into spinal cord repair has made enormous progress in recent years. Stem cell therapy may potentially help a seriously paralyzed person breathe unaided, regain sensation, improved bladder and bowl control or regain the use of their limbs.