Episiotomy incision was extended posteriorly beyond perineal body injuring the structure immediately posterior to it. Which structure has been injured
Ext. anal sphincteris present just posterior to perineal body. Therefore, Ext. anal sphincter can be injured when episiotomy incision given posteriorly beyond perineal body.
External anal sphincter
Ischiocavernosus
Bulbospongiosus
Urethral sphincter
NEET Jan 2020