atlas bone

atlas bone

The uppermost, or first, vertebra of the spinal column. The atlas is unique in having no body or spinous process. In head nodding, the skull moves on the atlas, but in head rotation the atlas locks with the skull and both rotate on the second vertebra, the AXIS.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
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They focus on the root cause of the problem and utilize the Atlas bone as a lever to bring about structural changes to the entire spine.
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He said: "The killers removed the boy's Atlas bone, the vertebra that connects the neck and spine.
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The men came in and out, bringing in artifacts: necklaces of dried boar penises, nautilus shell, the human atlas bone.
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