The works follow a few main points: The first is that the general theory held by Medicine, Chiropractic and other healthcare disciplines that pinching of a nerve causes reduction of nerve function is incorrect as a basic mechanism. It does occur but the reason for it is not the pinching effect. The basic mechanism behind reduction of nerve function is stretch of the nerve. Breig showed those effects in experiments over the course of 30+ years but it was Yamada especially and others who definitively demonstrated the mechanism during research on Tethered Cord Syndrome.
One can read the details in the references below. The basic data and the effects can be explained without going into the biology and chemistry. The basic point is that if nerve cells are just stretched to a certain point, with NO DAMAGE TO THE NERVE CELLS, the nerves cease to function. Lay people working to understand this section need to know the difference between Upper Motor Neuron problems and Lower Motor Neuron problems, see the box to the side.
When structure becomes misaligned and begins to breakdown, IF it does so in a way that causes the stretch of the brain, brain stem and spinal cord you will often get the production of hard lumps of tissue from the rubbing of the various tissues in the spinal cord. (These are the “sclerosis” tissues — “sclerosis” is from Greek and means hardening. Multiple Sclerosis is just a Latin term meaning many hard lumps of tissue. It is a descriptive term because the medical people have no idea how it works).
Once the sclerotic (hard) lumps of tissue are in the brain, brain stem and/or cord, they only cause problems if the cord is stretched from head to tail (buttock). Without the additional stretch from a person being stuck forward the nerves are not stretched enough to adversely affect them. This is also true of things outside the spinal cord like disc problems and bone spurs. The best way to explain this is a diagram from Breig’s book.
A few terms to understand for the caption are listed below:
Upper Motor Neuron
is a nerve cell going from the brain down the spinal cord. It ends on and controls the actions of the Lower Motor Neurons by inhibiting the LMN from constantly firing.
When the UMN is absent or not working the Lower Motor Neurons continuously fire causing the constant contraction of the muscles it controls.
This is called spastic paralysis because there is no control of the muscles (paralysis) yet the Lower Motor Neuron constantly firing on it causes constant contraction of the muscle (spasm).