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What is Nerve supply above pectinate line is through ? and explain in detail?
Nerve supply of anal canalMucous membrane above pectinate line is supplied by autonomic nerves (sympathetic L1 L2 and parasympathetic: S2 S3 S4) and therefore is insensitive to pain.Pa below the pectinate line is supplied by somatic nerves (inferior rectal nerve a branch of pudendal nerve) and therefore is sensitive to pain.Thus pain sensations are carried by pudendal nerve.