Nerve supply above pectinate line is through ?
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.
Inferior rectal nerve
Pudendal nerve
Autonomic nerves
Perineal branch of S4