A Manual of Osteopathic Manipulations and Treatment #265992

Care must be taken to become thoroughly familiar withthe normal, in order that any varia tion from this type may be detected. There are variations within a limited range, even in health. The dorsal and pelvic curves are primary and are due to the shape of the vertebrae, while the cervical and lumbar are secondary and compensatory and exist only after birth, their existence being due to modifications in the form of the intervertebral discs.