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MBBS QUESTION #10161
Question 1
A patient develops loss of pain and temperature sensation on the side of the body opposite a spinal cord lesion, beginning a few segments below the lesion, while joint position sense remains intact on both sides. Which tract is most likely damaged?
  • Dorsal column-medial lemniscus pathway
  • Lateral spinothalamic tract✔️
  • Lateral corticospinal tract
  • Posterior spinocerebellar tract
Correct Answer Explanation
The lateral spinothalamic tract carries pain and temperature; its fibers decussate in the anterior white commissure 1-2 spinal segments above their level of entry before ascending, so a unilateral cord lesion produces contralateral pain/temperature loss beginning a few levels below the lesion — a key finding in Brown-Séquard syndrome.