Many muscles connect to the tailbone. The levator ani is a broad but thin muscle that sits on either side of the pelvis. It connects to the anterior area of the coccyx. It consists of three smaller muscles, the iliococcygeus, the pubococcygeus, and the puborectalis. Both the iliococcygeus and the pubococcygeus connect to the coccyx. The coccygeus also attaches to the coccyx. This muscle, along with the levator ani, forms the pelvic diaphragm. On the posterior side of the coccyx, there is an attachment site for the gluteus maximus, the large muscle that helps extend the thigh.

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