You recommended pelvic muscle strengthening exercises to promote fecal continence. What role do the pelvic floor muscles play in the defecation process?

• A. It causes rectal distention, so the IAS relaxes
• B. It provides a sling like support around the anal canal
• C. It contracts to help with stool elimination
• D. It promotes anorectal angle of 90-degree during defecation

Answer: (B)

The pelvic floor muscles act as a supportive sling around the anal canal, creating a stable platform for the anorectal junction. This sling helps maintain continence at rest by providing outward support and coordinating with the anal sphincters. During defecation, the pelvic floor relaxes (including the puborectalis portion), which straightens or opens the anorectal angle to allow stool to pass. Strengthening these muscles enhances the support surrounding the anal canal and improves the ability to sustain closure when needed, while still permitting coordinated relaxation for defecation. The other statements don’t fit because rectal distention triggers relaxation of the internal anal sphincter via a reflex, contraction of the pelvic floor would impede stool passage, and defecation involves a reduced, not maintained, anorectal angle rather than a fixed 90-degree angle.