Figures
Stabilization of the axis (view from superior aspect). The therapist's thumb and index finger provide broad contact around the neural arch of the axis. The hand is “cupped,” and the thumb is adducted.
Neutral position: angle formed by the intersection of line 1 indicating the superimposed position of the line joining the transverse foramena and line 2 between the internal carotid arteries entering the foramena lacerum (a).
Rotation stress test position: angle formed (θ) by the intersection of line 1 indicating the superimposed position of the lines joining the transverse foramena and line 2 between the internal carotid arteries entering the foramena lacerum (a).
Tables

Angles (in Degrees) Formed by the Intersection of the Lines Joining the Transverse Foramena and the Foramena Laceruma
↵a Angles formed by the intersection of the lines joining the transverse foramena (line 1) and foramena lacerum (line 2), as illustrated in Figures 1 and 2, indicate rotation of the occiput with respect to the axis in neutral and rotation stress test positions.