Neuroanatomy USMLE Step 1 Practice Question
A 47-year-old male presents with progressive unsteady, broad-based gait and slow, slurred speech. Vital signs: BP 138/82 mmHg, HR 88/min, RR 16/min, Temp 37°C. Neurologic examination reveals dysdiadochokinesia, intention tremor, hypotonia, and nystagmus. MRI shows cerebellar atrophy. Cranial nerves II-XII are intact. The patient's lesion is located in a brain structure derived from which of the following embryonic structures?
Answer choices
- AMyelencephalon
- BTelencephalon
- CDiencephalon
- DMetencephalonCorrect answer
- EMesencephalon
- FRhombencephalon
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