The sacrum is the triangular bone at the base of the spin, made of fused vertebrae and situated between the two halves of the pelvis - like a wedge. Its upper part connects with the last lumbar vertebra, and bottom part with the coccyx (tailbone).

The sacrum is the triangular bone at the base of the spin, made of fused vertebrae and situated between the two halves of the pelvis - like a wedge. Its upper part connects with the last lumbar vertebra, and bottom part with the coccyx (tailbone).

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