Card 6 / 13: Hemiballismus on the left side is usually due to a vascular accident affecting the:
A.)
Left subthalamic nucleus.
B.)
Right subthalamic nucleus.
C.)
Right striatum.
D.)
Left striatum.
Answer:
B.) Right subthalamic nucleus.
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The right subthalamus has reciprocal inhibitory connections with the right globus pallidus. Since right basal ganglia influence the right cortical motor areas through the thalamus, the release of normal inhibitory control, ``release of function'', would be manifest by flailing movements on the left side of the body.
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