Origin: Ischial spine and from the posterior part of the tendinous arch of the pelvic fascia
Insertion: Coccyx and anococcygeal raphe
Nerve: Levator ani nerve (S4) - inferior rectal nerve from pudendal nerve (S3, S4) - coccygeal plexus
Action: Supports the viscera in pelvic cavity
The Iliococcygeus arises from the ischial spine and from the posterior part of the tendinous arch of the pelvic fascia, and is attached to the coccyx and anococcygeal raphé; it is usually thin, and may fail entirely, or be largely replaced by fibrous tissue. An accessory slip at its posterior part is sometimes named the Iliosacralis.