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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
The nerve root blocked in pudendal nerve block
assistant
The correct answer is  Pudendal nerve block, blocks sacral segments (S2-4) thus provides perineal analgesia. The anesthesia is produced by blocking the pudendal nerves near the ischial spine of the pelvis. The pudendal block gets its name because a local anesthetic, such as lidocaine or chloroprocaine, is injected into the pudendal canal where the pudendal nerve is located. Ref Robbins 9/e pg 345