Alzheimer's disease,the most common form of dementia,is a progressive and, ultimately,fatal brain disease. It destroys brain cells, causing problems with memory, thinking and behavior. The symptoms of Alzheimer's are divided into "cognitive" and "behavioral and psychiatric." Cognitive symptoms affect memory, language, judgment, planning and other thought processes, and are usually treated with medications.Parkinson's diseaseis a chronic, degenerative neurological disorder that affects one in 100 people over the age of 60, and can be diagnosed asearly as age 30. The disorder of the central nervous system results from the loss of cells invarious parts of the brain, including a region called the substantia nigra which produces dopamine.Dopamine is a chemical messenger responsible for transmitting signals within thebrain that allow for coordination of movement. Loss of dopamine for transmitting signals within the brain thatallow for coordination of movement. Loss of dopamine causes neurons to fire without normal control, leaving patients less able to direct or control their movement.

Symptoms can include resting tremor, slowness of movement, postural instability, and rigidity. In addition, patients can suffer from mild memory difficulties to dementia, mood disorders, constipation, sleep problems, speech difficulties, unexplained pain and loss of smell.

MultipleSclerosis (MS) is an autoimmune disease that affects the central nervous system, which consists of the brain, spinal cord and optic nerves. Surrounding and protecting the nerve fibers of the central nervous system is a fatty tissue called myelin, which helps nerve fibers conduct electrical impulses. In MS, myelin is lost in multiple areas, leaving scar tissue and sometimes damaging the nerve fiber itself. The inability of nerve fibers to conduct electrical impulses produces the various symptoms of MS. These symptoms are unpredictable and can vary from patient to patient and from time to time.