05-13-2011, 06:25 PM
22.BB
Hemiballismus is usually characterized by involuntary flinging motions of the extremities. The movements are often violent and have wide amplitudes of motion.They are continuous and random and can involve proximal and/or distal muscles on one side of the body. Some cases even include the facial muscles.
It is common for arms and legs to move together. The more a patient is active, the more the movements increase. With relaxation comes a decrease in movements.
The subthalamic nucleus essentially provides the excitement needed to drive the globus pallidus. Injury to this area or its efferent or afferent connections can induce this disorder. The structure itself is a regulator of motor function and is also involved in associative and limbic functions.
It was traditionally thought that the disorder was only caused by injury to the subthalamic nucleus, but new studies are showing that damage to other areas of the brain can also be responsible for causing this disorder. Hemiballismus caused by lesions in the subthalamic nucleus is more severe than other forms of the disorder
Wikipedia
Hemiballismus is usually characterized by involuntary flinging motions of the extremities. The movements are often violent and have wide amplitudes of motion.They are continuous and random and can involve proximal and/or distal muscles on one side of the body. Some cases even include the facial muscles.
It is common for arms and legs to move together. The more a patient is active, the more the movements increase. With relaxation comes a decrease in movements.
The subthalamic nucleus essentially provides the excitement needed to drive the globus pallidus. Injury to this area or its efferent or afferent connections can induce this disorder. The structure itself is a regulator of motor function and is also involved in associative and limbic functions.
It was traditionally thought that the disorder was only caused by injury to the subthalamic nucleus, but new studies are showing that damage to other areas of the brain can also be responsible for causing this disorder. Hemiballismus caused by lesions in the subthalamic nucleus is more severe than other forms of the disorder
Wikipedia