Which statement characterizes the primary respiratory mechanism in cranial theory?

• A. It is the inherent cranial motion
• B. It arises from autonomic influences
• C. It is measured by rib spring testing
• D. It is unrelated to cranial motion

Answer: (A)

In cranial theory, the primary respiratory mechanism is the inherent, intrinsic motion of the brain and its surrounding structures. This rhythmic, subtle mobility arises from the brain and meninges themselves and is transmitted to the cranial bones through the dural attachments and the fluid–tissue dynamics of the meninges and CSF. It is not something driven by autonomic input, nor is it something assessed by rib spring testing, which checks rib motion and thoracic mechanics rather than cranial motion. So the best description is that the primary respiratory mechanism reflects the inherent cranial motion that underlies the small but meaningful movements of the cranial bones and associated structures.