The foundation of chiropractic care has always been the relationship between the musculoskeletal system and the nervous system. The understanding of this relationship has become more sophisticated and we now realize that the integrity of the human frame and its ability to move as designed can have implications in pain perception, muscle control, coordination, sleep, internal organ function, and immune response. This book provides an in-depth review of the ways in which abnormal movement in the musculoskeletal system (particularly the spine) will result in altered nervous system function and the potential for poor health.