Rectal incontinence is due to involvement of :a) External anal sphincterb) Internal anal sphincterc) Ischiococcygeusd) Pubococcygeus

Rectal continence depends solely on the anorectal ring and any damage to this ring results in rectal incontinence. The anorectal ring is a muscular ring present at the anorectal junction, and formed by the fusion of - Puborectalis (a part of pubococcygeus which in turn is a part of levator ani) Deep external anal sphincter Internal anal sphincter The puborectalis muscle appears to be the most important muscle for maintaining fecal continence.