Comprehensive Osteopathic Medical Licensing Examination (COMLEX USA) Practice

What is the typical frequency in cycles per minute for cranial rhythmic impulse (CRI)?

1. 3-5 cycles

2. 8-12 cycles

3. 15-20 cycles

4. 25-30 cycles

The correct answer is: 8-12 cycles

The cranial rhythmic impulse (CRI) is a term used in osteopathic practice to describe the subtle, rhythmic motion of the cranial bones and the surrounding tissues, which is believed to be associated with the underlying cerebrospinal fluid dynamics and the inherent motility of the brain and spinal cord. The typical frequency of CRI is considered to be between 8 and 12 cycles per minute. This range reflects the normal physiological rhythm that practitioners assess during osteopathic manipulative treatment. It is an important concept within the field as it signifies optimal health of the craniosacral system. When the frequency falls within this range, it is often interpreted as a sign of balanced cranial motion, potentially indicating the body's ability to maintain proper function and response to treatment. Recognizing this typical frequency is crucial for practitioners to evaluate and diagnose any possible dysfunctions or alterations in the cranial rhythm, which may suggest underlying health issues or conditions. Understanding the normal range also allows for better interpretation of the findings during clinical assessments and encourages an appropriate treatment approach based on the observed CRI.