Back pain is the result of complex spine and muscles surrounding it and support it. Spine protects the spinal cord - a branch of the nervous system connects the brain to the rest of the body.
It is customary to divide the spine back into three parts: Part curved outward, part hip and part of the tail. All links are numbered, and the letter indicates the part which they belong. L3 vertebra, for example, is the third link in the lumbar section of the spine.
