The main structure to which the coccyx connects is the sacrum. This large triangular bone sits between the two wings of the pelvis. The sacrum and the first coccygeal vertebra share a similar appearance. The coccyx connects with the sacrum at an amphiarthrodial joint, the sacrococcygeal symphysis. Unlike other joints, amphiarthrodial joints allow for little movement. In addition to connecting to the sacrum, the coccyx also serves as the attachment point for some muscles and ligaments.

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