Cranial osteopathy was developed by Dr William.G.Sutherland in the early 20th century. The human skull is not merely one solid, immoveable bone but in fact 22 bones that are joined together like a very complicated three dimensional jigsaw puzzle. Sutherland hypothesised that the cranial bones, sacrum, brain, spinal cord and the membranes around them all possess subtle and differing movements that, with practice can be felt (palpated).