Parkinson's is a neurodegenerative disease. Movement is normally controlled by dopamine, a chemical that carries signals between the nerves in the brain. When cells that normally produce dopamine die, the symptoms of Parkinson's appear.

The most common symptoms are:

• Tremor
• Slowness and stiffness
• Impaired balance
• Rigidity of the muscles

http://www.parkinsonalberta.ca/

Tourette Syndrome Foundation – Edmonton Chapter

Tourette Syndrome (TS) is a neurological or " neurochemical " disorder characterized by tics -- involuntary, rapid, sudden movements or vocalizations that occur repeatedly in the same way.

http://www3.telus.net/public/breno620/tsedmontonchapter/

Multiple Sclerosis Society of Alberta

MS attacks the protective covering — myelin — of the brain and spinal cord, causing inflammation and often damaging the myelin in patches. When this happens, the usual flow of nerve impulses along nerve fibres (axons) is interrupted or distorted. The result may be the wide variety of MS symptoms, depending upon what part or parts of the central nervous system are affected.

http://www.mssociety.ca/alberta/default.htm