The Sacrum

The sacrum is a large triangular bone at the base of the lower spine. It connects the lowest lumbar vertebrae to the ilium bones (the largest bones in the pelvis), the attachment being made by cartilage.
The sacrum actually starts out as five separate vertebrae, which by about age twenty-five have fused together.

The narrow lower part of the sacrum joins the coccyx or 'tail bone'.


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