الفهرس 
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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,