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.
Parkinson's disease is caused by a loss of nerve cells in the part of the brain called the substantia nigra.Nerve cells in this part of the brain are responsible for producing a chemical called dopamine.t is not known why the loss of nerve cells associated with Parkinson's disease occurs, although research is ongoing to identify potential causes. Currently, it is believed that a combination of genetic changes and environmental factors may be responsible for the condition.