Neuroanatomy basics · USMLE Step 1

A patient has difficulty performing rapid alternating movements (dysdiadochokinesia). Which region is most likely affected?

  1. Cerebellar hemisphere
  2. Basal ganglia
  3. Motor cortex
  4. Medulla oblongata
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Correct answer: Cerebellar hemisphere

The cerebellar hemispheres coordinate limb movement and rapid alternating motions. Damage causes ataxia and intention tremor.

Difficulty: Medium Question 6 of 20

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