In addition to acting as an attachment site for muscles, the tailbone also serves as an attachment site for many ligaments. Both the anterior and posterior sacrococcygeal ligaments connect to the coccyx. These are continuations of the ligaments that stretch along the spine. The lateral sacrococcygeal ligaments stretch from the lower area of the sacrum and attach to the coccyx, helping stabilize the joint where the sacrum and the coccyx meet. Some of the fibers of the sacrotuberous and sacrospinous ligaments also connect to the coccyx.

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