Craniosacral therapy is a form of alternative medicine deployed by massage therapists, osteopaths, and chiropractors. It involves exerting mild pressure on the craniosacral system which consists of membranes and cerebrospinal fluid within which the brain and spinal cord lie. Craniosacral therapy eases the restrictions of nerve passages, helps reduce mental stress, and alleviates back and neck pain. It also has a beneficial effect on migraines. Two ideas central to craniosacral therapy are motility of the central nervous system and mobility of the cranial bones. A typical craniosacral therapy session may follow a ten-step protocol and last up to one hour.