In vertical strains, which axis do the bones rotate around, and in what direction?

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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 vertical strains, which axis do the bones rotate around, and in what direction?

Explanation:
Vertical strains move the sphenoid and occiput together along a vertical path by rotating around two parallel horizontal (left–right) axes. Both bones rotate in the same direction around those horizontal axes, producing the vertical displacement of the SBS. This is why the correct description is two horizontal axes in the same direction. Rotating about vertical axes in opposite directions would produce a different pattern, rotation about an anteroposterior axis describes torsion rather than vertical strain, and having no rotation would not create the vertical displacement these strains require.

Vertical strains move the sphenoid and occiput together along a vertical path by rotating around two parallel horizontal (left–right) axes. Both bones rotate in the same direction around those horizontal axes, producing the vertical displacement of the SBS. This is why the correct description is two horizontal axes in the same direction.

Rotating about vertical axes in opposite directions would produce a different pattern, rotation about an anteroposterior axis describes torsion rather than vertical strain, and having no rotation would not create the vertical displacement these strains require.

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