Puborectalis
Pelvic Floor
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This muscle literally creates a kink in your rectum — it's why you don't have to think about holding it in. It relaxes when you sit in a squat position.
Function
Maintains anorectal angle for fecal continence
Origin
Posterior surface of pubic body
Insertion
Forms a sling around the rectum
Innervation
Branches of S3-S4