Atlas (C1) vs. Sacrum: Relative Spinal Anatomy
The atlas (C1) is the superior-most cervical vertebra, articulating with the occiput.
The sacrum is the inferior fused terminal segment (S1–S5) forming the pelvic posterior wall.
Thus, the atlas is superior to the sacrum along the cranio-caudal axis. The original statement "atlas is not superior to sacrum" is anatomically incorrect.
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