Neuroanatomy basics · USMLE Step 1

A lesion of the inferior cerebellar peduncle causes which deficit?

  1. Ipsilateral limb ataxia
  2. Contralateral limb ataxia
  3. Bilateral tremors
  4. Spastic paralysis
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Correct answer: Ipsilateral limb ataxia

The inferior cerebellar peduncle carries proprioceptive input to the cerebellum. Lesions cause ipsilateral ataxia because cerebellar output influences ipsilateral body coordination.

Difficulty: Medium Question 11 of 20

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