The coccygeus is a muscle of the pelvic floor. It is a small triangular muscle located posterior to the levator ani muscle group. Attachments: Originates from the ischial spines and inserts onto the inferior end of the sacrum and coccyx. Actions: Supports the pelvic viscera and flexes the coccyx. Innervation: Anterior rami of S4 and S5. Blood supply: Inferior vesical, inferior gluteal 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 Print Article Rate This Article