Unlike disorders of the motor cortex and corticospinal (pyramidal) tract, lesions of the basal ganglia disrupt movement:
A) Without causing paralysis
B) Posture and muscle tone
C) And cortical responses
D) Of upper motor neurons
Ans: A
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Disorders of the basal ganglia comprise a complex group of motor disturbances characterized by tremor and other involuntary movements, changes in posture and muscle tone, and poverty and slowness of movement. They include tremors and tics, spasticity, hypokinetic disorders, and hyperkinetic disorders. Unlike disorders of the motor cortex and corticospinal (pyramidal) tract, lesions of the basal ganglia disrupt movement but do not cause paralysis. Disorders of the upper motor neuron pyramidal tracts are characterized by spasticity and paralysis.
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