The axis is the second cervical vertebra, unique for its upward-projecting dens (odontoid process) that acts as a pivot around which the atlas — and therefore the head — rotates to produce the 'no' head-shaking movement.
The odontoid process (dens) is the most common site of cervical spine fracture in the elderly, from low-energy falls that produce a sudden head flexion force. Anderson and D'Alonzo classify these as type I (rare, through the tip), type II (most common, through the base — highest non-union rate), and type III (into the body). Hangman fractures are traumatic spondylolisthesis of C2 through the pars interarticularis from hyperextension-distraction injuries.
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