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MBBS QUESTION #10204
Question 1
The pudendal nerve, which supplies most of the perineum, exits the pelvis through the greater sciatic foramen and re-enters via the lesser sciatic foramen before running in the pudendal (Alcock's) canal. Injury to this nerve (e.g., during childbirth or prolonged cycling) most characteristically causes sensory loss over which region?
  • The anterior thigh
  • The perineum (external genitalia and anal region)✔️
  • The buttock only, sparing the perineum
  • The medial leg
Correct Answer Explanation
The pudendal nerve (S2-S4) is the principal somatic sensory and motor nerve of the perineum, supplying the external anal sphincter, external urethral sphincter, and skin of the genital and anal regions; its injury or compression classically produces perineal numbness and, over time, incontinence.