In SBS torsion, which axis is involved and what is the relative motion of the sphenoid and occiput?

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Prepare for the OMM 6 Cranial Evaluation and Treatment Test. Use flashcards and multiple-choice questions, each with hints and explanations. Get ready for your exam!

Multiple Choice

In SBS torsion, which axis is involved and what is the relative motion of the sphenoid and occiput?

Explanation:
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.

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.

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