Locomotion and Movement

Question

The joint between atlas and axis is called

  • Pivot joint

  • Hinge joint

  • Saddle joints

  • Angular joint

Answer

A.

Pivot joint

Axis vertebra possesses a peg-like structure called the odontoid process which projects forward from the centrum. It fits into the cavity of the atlas below the ligament so that it is separated from the neural canal. Such an arrangement gives a pivot joint which allows the head to shake (rotate from one side to the other).

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