Abstract
Involuntary movements and parkinsonism have been interesting and important topics in neurology since the last century. The development of anatomical and physiological studies of the neural circuitry of motor systems has encouraged the study of movement disorders by means of pathophysiology and brain imaging.Multichannel electromyography from affected muscles has generated objective and analytical data on chorea, ballism, athetosis, and dystonia. Studies using floor reaction forces revealed the pathophysiology of freezing of gait in parkinsonism. Akinesia and bradykinesia are attributable to dysfunctions in the basal ganglia, frontal lobe, and parieto-occipital visual association cortex.Reciprocal innervation is an essential mechanism of smooth voluntary movement. Spinal reflexes on reciprocal innervation has been investigated in awake humans, and the pathophysiology of spasticity and Parkinson’s disease were revealed as a result. Clinical applications for the treatment and evaluation of status have been developed.For future studies, detailed neural mechanisms underlying the development of motor disorders in basal ganglia diseases and recovery by interventions including surgery and neurorehabilitation are important.
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