Foundations in Craniosacral Biodynamics, Volume One by Franklyn Sills

Author:Franklyn Sills [Sills, Franklyn]
Language: eng
Format: epub
Tags: OCC011000 Body, Mind & Spirit / Healing / General
Publisher: North Atlantic Books
Published: 2016-09-20T16:00:00+00:00

The Reciprocal Tension Membrane

The reciprocal tension membrane (RTM) is a classic example of a tensile field of action organized around a suspended automatic shifting fulcrum. It is composed of the inner leafs of dura in the cranium comprising the falx cerebri, falx cerebelli, and tentorium cerebelli. These leafs form a continuous membrane that holds natural tension and shifts as a unified field of action in the phases of primary respiration. The sickles of the falx and tentorium can be thought of as arising from their meeting place at the straight sinus (Figure 13.1). The falx cerebri has anterior continuity with the crista galli of the ethmoid bone and posterior continuity with the occipital squama at the internal occipital protuberance (Figure 13.2). The tentorium has lateral continuity with the temporal bones; its posterior aspect is continuous with the occipital squama and its anterior aspect with the clinoid processes of the sphenoid bone (Figure 13.3). The dural tube can be thought of as being continuous with the falx and tentorium and has a completely integrated dynamic. All of these membranes are continuous in their structure and function and are part of the unified reciprocal tension membrane system. Further, the outer surface of the dura is continuous with the periosteum of cranial bone, and bone and membrane manifest a unified dynamic.

Embryologically, cranial bones develop in the same mesenchyme from which membrane arises. First the mesenchymal fields are generated and then the membranous and cartilaginous fields arise, within which cranial bone condense. Cranial vault bones also organize in the developing dural membrane in relation to its stretches and condensation fields (Blechschmidt 2004). Cranial bone and membrane develop from the same mesenchyme and this embryological oneness is maintained throughout life. It is impossible to discuss membranous motility without understanding its continuity with bony motility, as all cranial motility is membranous-articular in nature, manifesting as a unified field of action.

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