The sidebending dysfunction is named for which side?

The sidebending dysfunction is named for which side?

• A. The side that widens.
• B. The side that narrows.
• C. The side of the basi-occiput.
• D. The side of the basi-sphenoid.

Answer: (A)

The main idea is that sidebending-rotation dysfunction is identified by a unilateral widening of the cranial vault on one side. The side you observe as wider is the side used to name the dysfunction. In practice, palpation reveals the skull widening on that side, and that becomes the reference for the diagnosis. The rotation component travels about an oblique axis, but the naming hinges on which side shows the expansion. So the side that widens is the side the dysfunction is named after. The other possibilities aren’t used for naming because the observable, descriptive cue is the unilateral widening, not narrowing or a relation to the basi-occiput or basi-sphenoid.

The main idea is that sidebending-rotation dysfunction is identified by a unilateral widening of the cranial vault on one side. The side you observe as wider is the side used to name the dysfunction. In practice, palpation reveals the skull widening on that side, and that becomes the reference for the diagnosis. The rotation component travels about an oblique axis, but the naming hinges on which side shows the expansion. So the side that widens is the side the dysfunction is named after. The other possibilities aren’t used for naming because the observable, descriptive cue is the unilateral widening, not narrowing or a relation to the basi-occiput or basi-sphenoid.