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Parkinson's disease
Parkinson's disease is a degenerative disorder of the central nervous system that impairs the sufferer's motor skills and speech.
The disease is named after English physician James Parkinson; where he made a detailed description of the disease, which he later wrote on his essay: "An Essay on the Shaking Palsy" (1817).

Parkinson's disease belongs to a group of conditions called movement disorders. It is characterized by physical movement (akinesia). The primary symptoms are the results of decreased stimulation of the motor cortex by the basal ganglia, normally caused by the insufficient formation and action of dopamine, which is produced in the dopaminergic neurons both chronic and progressive.

PD is also called "primary parkinsonism" or "idiopathic PD" (classically meaning having no known cause although this term is not strictly true in light of the plethora of newly discovered genetic mutations). While many forms of parkinsonism are "idiopathic", "secondary" cases may result from toxicity most notable drugs, head trauma, or other medical disorders.