The mobility of the intracranial and intraspinal membranes is described as which term?

• A. Reciprocal Tension Membrane
• B. Dural Arc Movement
• C. Cranial Membrane Oscillation
• D. Meningeal Mobility Theory

Answer: (A)

The mobility of the intracranial and intraspinal membranes is described by Reciprocal Tension Membrane. In this view, the dura and its associated meningeal layers form a continuous, tensioned system from the skull to the sacrum. When one part of this membrane system moves, the opposing parts balance that movement through reciprocal tensions, creating a coordinated, interconnected mobility throughout the craniospinal axis. This terminology directly captures that interconnected, balanced tension across the whole membranous network. Other terms don’t reflect this specific, integrated tension-based model and are not standard descriptors of this concept.