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Abstract The term involuntary movement disorders implies that the movements are not under volitional control the patient cannot stop them at will. The movements are usually absent during complete relaxation especially during sleep, they are brought out by attempts to maintain a given posture or to carry out a skilled motor act. Further more, the movements are without apparent purpose. Involuntary movements occur principally in diseases of Basal Ganglia and of the Cerebellum. Chorea consists of rapid, involuntary, non rythmie jerks of various parts of the body. The movements are seen to occur first in one part of the body and then in another with marked irregularity and failure to be repetitive at a single site. Hypotonia is frequently present (Lockman,l982). Athetosis is a slow writhing movement, often more marked in the distal extremeties, consisting of alternating supination-pronation and flexion-extension of the limbs. Dystonia is a tendency toward extension of joints , brought out especially when the patient tries to walk, |