The Reciprocal Nature of the
Cranio Sacral System.
  Every structure in the body is covered in fascia a thin membrane. From the smallest neuron to large structures like your lungs or your liver, they are all covered in fascia.
  Fascia is continuous from our head to our feet. The significance of that is that if there is a restriction in one part of the body the effects of it may not show up at the area of restriction but in another part of the body.
  It is a bit like slowly pulling the corner of a table cloth. Initially not much would happen but if you kept pulling the cloth the cups and saucers would start to move and eventually collide as they moved in the direction of your pulling.
  A cup and saucer clinking together on the far side of the table could be likened to the vertebrae in you neck punching a nerve yet the cause of the problem may be coming from a restriction in the lower spine that is pulling the whole spine down. 

  See these case histories as an example of the reciprocal nature of the cranio sacral system.
Case 1 Case 2