Unlike other parts of the body, the brain cannot produce new cells. Once brain cells are killed due to disease or injury, they cannot be restored. Therefore, if a certain part of the brain that controls any part of the body is damaged, that part may lose its functions forever.
Illness or injury can affect consciousness. If they take over the brain, it can lead to changes in memory, emotion and language functions.
A head injury can cause confusion in the victim. For any injury that results in confusion or loss of consciousness, the victim should be examined by a physician.
Damage to the spinal cord and nervous system can cause paralysis and loss of sensation or motor function. For example, an injury to the lower spine can lead to paralysis of the legs. A broken bone or deep wound can cause damage to the nervous system.