In a sidebending-rotation dysfunction, the sphenoid and occiput rotate around their axes in which manner relative to the anteroposterior axis?

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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 a sidebending-rotation dysfunction, the sphenoid and occiput rotate around their axes in which manner relative to the anteroposterior axis?

Explanation:
The key idea is that sidebending-rotation dysfunction involves a coupling of sidebending with rotation around the same front-to-back axis. The sphenoid and occiput rotate around their anteroposterior axes in the same direction. So when the head sidebends to one side, both bones twist in that same sense about the SBS axis, producing the observed pattern of motion. Rotating around a vertical axis would describe a different kind of movement, and rotating the two bones in opposite directions around the AP axis would correspond to a torsion pattern rather than sidebending-rotation.

The key idea is that sidebending-rotation dysfunction involves a coupling of sidebending with rotation around the same front-to-back axis. The sphenoid and occiput rotate around their anteroposterior axes in the same direction. So when the head sidebends to one side, both bones twist in that same sense about the SBS axis, producing the observed pattern of motion. Rotating around a vertical axis would describe a different kind of movement, and rotating the two bones in opposite directions around the AP axis would correspond to a torsion pattern rather than sidebending-rotation.

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