Patient sits on the table.

Operator stands behind with the thumb and index finger of the right hand grasping the posterior arch of the atlas and the left hand on top of the head to introduce movement.

Operator’s left hand introduces backward-bending, left side-bending, and right rotation of the head sensing for prominent fullness under the right thumb indicating posterior rotation of the atlas on the left.

Operator’s left hand introduces backward-bending, right side-bending, and left rotation of the head and monitors for prominence of the right posterior arch of the atlas under the right index finger, indicative of right rotation of the atlas.

Operator introduces forward-bending, right side-bending, and left rotation with the left hand while monitoring for prominence of the right posterior arch of the atlas under the right index finger, indicating atlas right rotation.

Operator introduces forward-bending, left side-bending, and right rotation of the head with the left hand while monitoring for prominence of the left posterior arch of the atlas under the right thumb, indicating left rotation of the atlas.