<prompt> Nerve supply above pectinate line is through ?Inferior rectal nervePudendal nerveAutonomic nervesPerineal branch of S4  <response>: 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. 