Dorsal rhizotomy is the selective surgical ablation of which of the following?
A. Dorsal horn neurons
B. Posterior commissural axons
C. Dorsal roots
D. Dorsal columns
E. Nucleus dorsalis
ANS: C
Rationale: Dorsal rhizotomy is selective surgical ablation of the dorsal roots. The purpose of the surgery is to decrease or eliminate hyperreflexia by interrupting the afferent limb of the stretch reflex. The procedure is selective because individual dorsal rootlets are stimulated electrically before ablation to determine whether activity in that specific dorsal rootlet contributes to hyperreflexia. If stimulating the rootlet does not contribute to hyperreflexia, the rootlet is left intact to provide somatosensation.
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