Which one of the following spinal cord laminae process noxious sensory information?
A. Marginal layer
B. Substantia gelatinosa
C. Nucleus proprius
D. Both A and B
ANS: D
Rationale: Laminae I and II, called the marginal layer and substantia gelatinosa, respectively, process information about noxious stimuli. Laminae III and IV, together known as the nucleus proprius, process proprioceptive and two-point discrimination information.
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