<prompt> Episotomy extended posteriorly beyond perineal body injuring structure posterior to it, which structure is injured?External anal sphincterIshiocavernousBulbospongiosusUrethral sphincter  <response>: Episotomy extended posteriorly beyond perineal body will injure External anal sphincter. Extension of the incision in median episiotomy involve the rectal mucosa. structures attaching on perineal body Bulbospongiosus: anteriorly, surrounding urethra and vaginal opening Transverse perinei: laterally External anal spincter: posteriorly, surrounding anal opening. 