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Sacral vertebrae fuse to comprise the sacrum, a large bone at the base of the vertebral column, which connects to the hip bones. In humans, sacral vertebrae begin to fuse approximately at the age of 16, a process which is completed by the age of 35. In addition, the sacral intervertebral discs ossify into the adulthood and as a result, the newly forming sacrum bone does not include intervertebral discs.