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USMLE
Motor and Integrative Neurophysiology (II)
Questions 1 and 2 A 45-year-old man visits the physician because of difficulties performing simple tasks that involve repetitive movements. The physician asks the patient to turn one hand upward and downward at a rapid pace. The man quickly loses all perception of the instantaneous position of the hand, which results in a series of stalled attempts and jumbled movements. Use this information to answer Questions 1 and 2. Which area of his brain is most likely to have a lesion?
Explanation
ExplanationThe cerebellum plays major roles in the timing of motor activities and in rapid, smooth progression from one muscle movement to the next. Lesions of the cerebellum can also cause dysmetria, ataxia, past pointing, nystagmus, dysarthria, intention tremor, and hypotonia. The premotor cortex and primary motor cortex plan and execute movements. The limbic system is involved with behavior, motivation, emotion, long-term memory, and olfaction
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