Letter A

Axis

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The axis is the second cervical vertebra (symbol: C2).

It is called the 'axis' because the uppermost cervical vertebra (called the atlas) rotates about the odontoid process of C2. The joint between the axis and atlas is a pivot type of joint.

It allows the head turn.</P> The Latin word 'axis' means axle or pole.

The axis bone serves as the axle about which the atlas (and the head) turn.

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