The pelvic floor muscles are a group of muscles that seal the pelvic floor. They are composedof five muscles: the pubic and vaginal muscles, the pubic and rectal muscles, the pubic and coccygeal muscles, the iliac and coccygeal muscles, and the sciatic and coccygeal muscles.They act like a "hammock", tightly supporting the urethra, bladder, vagina, uterus, rectum,and other organs to maintain their normal position and function.