The sacrum is formed by how many fused vertebrae?

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Multiple Choice

The sacrum is formed by how many fused vertebrae?

Explanation:
Five vertebrae fuse to form the sacrum. The sacrum develops from five sacral vertebrae (S1–S5) that typically fuse into a single triangular bone by early adulthood. This fusion creates a strong base at the base of the spine, anchoring it to the pelvis and helping transmit weight downward. While some rare anatomical variations can alter the count, the standard anatomy is five fused vertebrae.

Five vertebrae fuse to form the sacrum. The sacrum develops from five sacral vertebrae (S1–S5) that typically fuse into a single triangular bone by early adulthood. This fusion creates a strong base at the base of the spine, anchoring it to the pelvis and helping transmit weight downward. While some rare anatomical variations can alter the count, the standard anatomy is five fused vertebrae.

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