<prompt> During incision drainage of ischiorectal abscess, which nerve isare affectedinjured:Superior rectal nerveInferior rectal nerveSuperior gluteal nerveInferior gluteal nerve  <response>: B i.e. Inferior rectal nerveThrough a posterior horse shoe shaped recess both ischiorectal fossae are connected behind the anal canal; so a unilateral abscess may become bilateral.During dissection of ischio rectal fossa, inferior rectal, pudendal, posterior scrotal or labial nerve vessels along with perforating branches of S2-S3 and perineal branches of S4 nerve may get damaged. 