Parkinson's Disease: Advanced Research and Clinical Care

Parkinson’s disease (PD) is a progressive disorder of the nervous system that affects the motor system. PD results in motor, neuropsychiatric, sensory and sleep diseases. Four cardinal motor symptoms in PD are tremor, postural instability, rigidity and slowness of movement. Neuropsychiatric disturbances such as disorders of mood, behavior, cognition and thought may also occur. An important underlying cause of Parkinson’s disease is the death of cells in the substantia nigra, lower levels of...