They are, in order of distance from Neptune: Naiad (48,227 km), Thalassa (50,074 km), Despina (52,526 km), Galatea (61,953 km), Larissa (73,548 km), S/2004 N 1 (105,300 Â± 50 km), and Proteus (117,646 km).
In this article. Font Size. A. A. A. Parkinson's disease is caused by the progressive impairment or deterioration of neurons (nerve cells) in an area of the brain known as the substantia nigra. When functioning normally, these neurons produce a vital brain chemical known as dopamine.here is considerable controversy surrounding the possibility of a genetic cause of Parkinson's disease. In a small number of families, specific genetic abnormalities leading to the illness have been identified.
in parkinson s disease certain nerve cells neurons in the brain gradually break down or die many of the symptoms are due to a loss of neurons that produce a chemical messenger in your brain called dopamine when dopamine levels decrease it causes abnormal brain activity leading to signs of parkinson s diseasethe cause of parkinson s disease is unknown but several factors appear to play a role includingany of the symptoms are due to a loss of neurons that produce a chemical messenger in your brain called dopamine when dopamine levels decrease it causes abnormal brain activity leading to signs of parkinson s disease the cause of parkinson s disease is unknown but several factors appear to play a role including