The Levator Ani is the major support for the pelvic viscera. It is composed of two portions, the pubococcygeus and the iliococcygeus. The pubococcygeus arises from the posterior surface of the pubic bone passing posteriorly to attach to the sides of the urethra, vagina, and rectum. The iliococcygeus muscle is the most posterior portion of the levator ani muscle. The pelvic diaphragm is composed of two portions, the levator ani and the coccygeous muscles.