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Movement disorders are neurological conditions that affect the speed, fluency, quality, and ease of movement. Abnormal fluency or speed of movement (dyskinesia) may involve excessive or involuntary movement (hyperkinesia) or slowed or absent voluntary movement (hypokinesia).
Movement disorders include the following conditions:
Ataxia (lack of coordination, often producing jerky movements)
Dystonia (causes involuntary movement and prolonged muscle contraction)
Huntington's disease (also called chronic progressive chorea)
Multiple system atrophies (e.g., Shy-Drager syndrome)
Myoclonus (rapid, brief, irregular movement)
Progressive supranuclear palsy (rare disorder that affects purposeful movement)
Restless leg syndrome(RSD) and periodic limb movement disorder (PLMD)
Tics(involuntary muscle contractions)
Tremor (e.g.,essential tremor, resting tremor)
Wilson disease (inherited disorder that causes neurological and psychiatric symptoms and liver disease)
Common dystonias includespasmodic torticollis, which affects muscles of the head, face, and neck, and blepharospasm, which causes involuntary closing of the eyelids.
Tourette's syndromeis an inherited disorder characterized by multiple motor and vocaltics(repeated muscle contractions). Symptoms of Tourette's usually develop during childhood or early adolescence. Patients with the disorder often develop behavioral problems such as hyperactivity, inattention, impulsivity, obsessions, and compulsions. In most cases, symptoms vary in frequency and in severity.
Ticsare involuntary muscle contractions that interrupt normal activities. They often are preceded by a strong sensation or urge that is temporarily relieved following the muscle contraction. Examples of common tics include the following:
Movement disorders occur as a result of damage or disease in a region located at the base of the brain (basal ganglia). The basal ganglia is comprised of clusters of nerve cells (neurons) that send and receive electrical signals and are responsible for involuntary movement. Movement disorders can result from the following:
Genetic disorders (e.g.,Huntington's disease, Wilson disease)
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