Neuroanatomy basics · USMLE Step 1

A patient presents with spasticity, hyperreflexia, and an upgoing plantar reflex on the right side. Which tract is most likely damaged?

  1. Right corticospinal tract above the decussation
  2. Right corticospinal tract below the decussation
  3. Left dorsal column
  4. Left spinocerebellar tract
Show answer and explanation

Correct answer: Right corticospinal tract below the decussation

Upper motor neuron signs on the right indicate a lesion in the corticospinal tract below the decussation in the spinal cord. This causes ipsilateral deficits.

Difficulty: Medium Question 3 of 20

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