Axis

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The axis is the second cervical vertebra (C2) and, together with the Atlas, forms a functional unit that is primarily responsible for head rotation.

Figure

Schematic Axis
Schematic illustration of the axis. Figure adapted from Gray's Anatomy.

Imaging

Dens axis on CT
Visualization of the dens axis in three different planes on CT.
Dens axis on transoral radiograph
Transoral radiograph showing an intact dens axis.

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