Comprehensive Osteopathic Medical Licensing Examination (COMLEX USA) Practice

Which element is primarily affected by cranial rotational strains?

1. Midline bones

2. Sacral base

3. Paired bones

4. All cranial bones equally

The correct answer is: Midline bones

Cranial rotational strains primarily affect the midline bones because these bones—such as the frontal, occipital, and sphenoid—are directly involved in the cranial movement associated with rotational strains. In this type of strain, the cranial base and the paired bones (such as the parietal and temporal bones) may not experience the same degree of motion as the midline bones. As a result, the midline bones undergo specific adjustments that reflect the rotational movement of the cranium, making them the primary structures impacted by these strains. Understanding the mechanics of cranial movement is essential, as it highlights how certain cranial structures can be more susceptible to change during specific types of osteopathic manipulative treatment and trauma.