The Parkinson desease is a commun neurological desorder, but his cause is still a mistery for science.In the sixties, the
researchers identified a fundamental cerebral default that distinguish the desease: the lost of brain cells that produce a chemical
substance, the dopamina, that hepls to lead muscular activity.The four principal symptoms are: trembling of hands, arms, legs, jaws and face, the rigidity of extremities and trunk, the slowness of movements or bradicinesia, and the postural inestability or the afection of balance and coordination. As long as these symptoms increased, the patients can have some dificulties to walk, talk and do other simple jobs.The illness is chronic and progressive, but not contagious or inhereted. Parkinson desease occurs when certain nerve cells or neurons in a brain area knowned as nigra substance, died or suffer some kind of deterioration. These neurons that produce the
dopamine are thechemical agents responsable of transmiting the signals between the nigra substance and the next relieve station of the brain, the striatum corpus to produce a fluid muscular activity with a clear purpose. The lost of dopamine cause that the nerve cells of the striatum act without control leaving the patients unables to direct or control their movements in a normal way. The Parkinson's patients have a loss of about 80% or more of the cells that produce dopamine in the nigra substance.Now a days these illness is diagnosticated to about 50.000 northamericans and it is espected that about half million more will be afected at any moment.There is no cure in these days for the desease, but the medicine levodopa or L-dopa supply a graet realief for the symptoms. Neurons use the levodopa to produce dopamine and replace the decreasing provision of dopamine in the brain.