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The sacrum is both the mechanical weight bearing base of the spinal column and the fused central posterior section of the pelvic girdel. The is defined as, one of three bones (sacrum and two pelvic bones) that make up the pelvic ring; consists of five fused sacral vertebrae.

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12y ago
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Q: What part of the spine is both the mechanical weight bearing base of the spinal column and the fused central posterior section of the pelvic girdel?
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