Hemiballismus is a movement disorder characterised by unilateral wild, large amplitude flinging movements of the arm and leg, normally causing falls and preventing postural maintenance. The term Movement has a variety of different meanings: Physical movement between points in space (A to B). The amount of movement is called distance. ... Amplitude is a nonnegative scalar measure of a waves magnitude of oscillation. ...

It is caused by a lesion or infarction in the contralateral subthalamic nucleus or its connections, usually in patients with a history of hypertension or diabetes, or following TB meningitis. The subthalamic nucleus normally regulates the globus pallidus by exciting the GPi, which in turn normally inhibits the ventral lateral nucleus of the thalamus. The reduced discharge in both causes disinhibition of the thalamus and consequent involuntary stimulation of the motor cortex. Altered dopaminergic feedback mechanisms may also be involved. [1] A lesion is a non-specific term referring to abnormal tissue in the body. ... In medicine, infarction is necrosis of tissue due to upstream obstruction of its arterial blood supply. ... The subthalamic nucleus is a small lens-shaped nucleus of the basal ganglia. ... Hypertension or high blood pressure is a medical condition where the blood pressure in the arteries is chronically elevated. ... This article is about the disease that features high blood sugar. ... Tuberculous lungs show up on an X-ray image Tuberculosis is an infection with the bacterium Mycobacterium tuberculosis, which most commonly affects the lungs (pulmonary TB) but can also affect the central nervous system (meningitis), lymphatic system, circulatory system (miliary TB), genitourinary system, bones and joints. ... Inferior view of a brain with meningitis caused by Haemophilus influenzae. ... The globus pallidus is one of the major nuclei of the basal ganglia. ... The thalamus is a part of the brain. ...

Chemical treatment is via dopamine blockade, or via surgical lesions to the globus pallidus, lenticular fasciculus or VL nucleus of thalamus. Dopamine is a chemical naturally produced in the body. ...