Iliococcygeus
Pelvic Floor
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The thinnest part of the levator ani — sometimes has gaps, contributing to pelvic organ prolapse.
Function
Supports pelvic floor, resists increases in intra-abdominal pressure
Origin
Tendinous arch of levator ani (obturator fascia)
Insertion
Anococcygeal raphe and coccyx
Innervation
Branches of S3-S4