Comprehensive Osteopathic Medical Licensing Examination (COMLEX USA) Practice

Which motion is typically associated with cranial compression?

1. Extension

2. Flexion

3. Circumduction with compression

4. Abduction

The correct answer is: Extension

Cranial compression is often associated with extension in the context of craniosacral and osteopathic manipulation. In the techniques of craniosacral therapy, extension refers to the motion of the cranial bones moving posteriorly, which occurs when the head is extended. This can lead to a decrease in the volume of the cranial cavity, putting pressure on the brain structures and cerebrospinal fluid. The extension of the cranial bones may also result in a compression of the dural membranes surrounding the brain, leading to symptoms that can affect the overall function of the central nervous system. In contrast, flexion generally involves the anterior motion of the cranial bones and tends to relieve pressure rather than cause it. Circumduction with compression and abduction are movements typically not directly linked to the concept of cranial compression. Understanding these motions and their implications is crucial for diagnosing and treating conditions related to cranial mechanics in clinical practice.