Iliococcygeus - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The iliococcygeus is a muscle of the pelvic floor. It forms the posterolateral part of the levator ani muscle group. Attachments: Originates from the ischial spines and the posterior tendinous arch of the internal obturator fascia. It inserts onto the coccyx, perineal body and anococcygeal ligament. It also blends with the fibres of the contralateral muscle in the midline of the pelvic floor. Actions: Elevates the pelvic floor and anorectal canal. Innervation: Nerve to levator ani and branches of the pudendal nerve. Blood supply: Inferior gluteal, inferior vesical and pudendal arteries. Adapted from work by OpenStax [CC BY 4.0], via Wikimedia Commons Fig 1Superior (bird’s eye) view of the pelvic floor. Note the prerectal fibres of the puborectalis. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Frequent questions What is the iliococcygeus muscle? The iliococcygeus is a muscle located in the pelvic floor, forming part of the levator ani muscle group. It plays a crucial role in supporting pelvic organs and maintaining pelvic stability. What are the attachments of the iliococcygeus muscle? The iliococcygeus originates from the ischial spines and the posterior tendinous arch of the internal obturator fascia, inserting onto the coccyx, perineal body, and anococcygeal ligament. It also integrates with the fibres of the opposite iliococcygeus muscle at the midline. What actions does the iliococcygeus perform? The primary action of the iliococcygeus is to elevate the pelvic floor and the anorectal canal. This function is essential for maintaining continence and supporting pelvic structures. What is the innervation of the iliococcygeus muscle? The iliococcygeus is innervated by the nerve to levator ani and branches of the pudendal nerve. This innervation is vital for its motor function and coordination within the pelvic floor. What is the blood supply to the iliococcygeus muscle? The iliococcygeus receives its blood supply from the inferior gluteal, inferior vesical, and pudendal arteries. Adequate blood flow is important for the muscle's health and function. Rate This Article