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.
Causes & Symptoms. Parkinsonâs disease is caused by damage to a special kind of nerve cells (neurons) in a specific part of the brain that produce a chemical called dopamine. Dopamine sends messages throughout the body that help control movement. In people with Parkinsonâs, these neurons produce less and less dopamine. As a result, controlling movement and carrying out other tasks gets increasingly difficult. The cause of the damage to these neurons is not known.