![]() ![]() 7 Certain types of coccygeal morphology also can lead to a predisposition to coccydynia. In some cases, the joints are fused together. In a study of the gross anatomy of intercoccygeal joints, Maigne, Guedj, and Straus describe the extensive variability in the structure of the joints: from intact discs resembling lumbar intervertebral discs to intermediate disc structures with cystic or fibrotic changes to synovial joints. These ligaments and muscles help support the pelvic floor and also contribute voluntary bowel control. ![]() Inferiorly, the iliococcygeus muscle tendon inserts onto the tip of the coccyx. Moving anteriorly to posteriorly, the lateral edges serve as insertion sites for the coccygeal muscles, the sacrospinous ligament, the sacrotuberous ligament, and fibers of the gluteus maximus muscle. The coccyx is bordered anteriorly by the levator ani muscle and the sacrococcygeal ligament. The lower part of the filum terminale, also called the coccygeal ligament, inserts onto this first segment. In addition, the first coccygeal segment contains rudimentary articular processes called the coccygeal cornua that articulate with the sacral cornua. 3, 5, 6 The coccyx is a triangular bone that consists of 3 to 5 fused segments, the largest of which articulates with the lowest sacral segment. ![]() The word coccyx is derived from the Greek word for the beak of a cuckoo bird because of the similarity in appearance when the latter is viewed from the side. The coccyx is the terminal segment of the spine. ![]()
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