External anal sphincter is innervated by: (A) L4, L5, (B) L5, S1, (C) S1, S2, S3, (D) S2, S3, S4
Answer is D. External anal sphincter is controlled by spinal nerves from the S2, S3 and S4 levels of your spinal cord, which form the pudendal nerve. ref - BDC vol2 pg 412-416