OMM 6 – Cranial Evaluation and Treatment Practice Test

In SBS torsion, the motion is a twist around an anterior-posterior axis that runs front to back through the skull. The sphenoid and occiput rotate in opposite directions about that axis—the sphenoid turns one way while the occiput turns the opposite way. This opposite rotation around the AP axis is what defines a torsion. Other axes describe different cranial motions, such as flexion-extension around a transverse axis or side-bending-rotation around a vertical axis, so they don’t capture the torsional pattern.