A lesion to which one of the following regions would result in crossed analgesia?
A. Dorsal horn of the spinal cord
B. Peripheral nerves
C. Medulla or lower pons
D. Thalamus
E. Cortex
ANS: C
Rationale: A lesion of the lower pons and medulla can produce crossed analgesia because axons conveying fast pain information from the face descend ipsilaterally near the spinothalamic tract, which carries pain information from the contralateral side of the body.
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