Relating to both the atlas (first vertebra) and the axis (second vertebra) of the cervical spine.
From 'atlanto-' (relating to atlas) + 'axial' (relating to the axis vertebra), combining two anatomical terms.
The atlantoaxial joint is your neck's most mobile and vulnerable point—it allows your head to turn side to side, but it's the thinnest place where bone protects your spinal cord.
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