It's not a secret that the human body is a single whole. Interconnections between individual systems exist due to nerve fibers. As for the innervation, it is segmental in nature. Proceeding from the spinal cord, each large nerve trunk carries its branches to the subcutaneous tissue, skin, muscles, fascia, internal organs, bones. Each organ gets its own nerve root on the surface of our skin. Most often, this "spine" means not only a certain active point, but also a wide area. Subject to the slightest deviation in the full functioning of this or that organ, it affects the skin and subcutaneous structures.
The impact on the corresponding area can radically change the function of this organ and the whole organism. Most of the biologically active points are concentrated in the area of the hands, feet, cervical spine, lumbosacral, collar zone.
Reflex zones of various organs are located side by side, and in some cases even intersect. Therefore, only a professional massage therapist will be able to determine the zones of influence that would hit the target exactly.