Glossary – W to Z
white matter: A portion of the brain or spinal cord containing mostly fiber tracts (communicating ‘wires’) rather than any nerve cell bodies.
xenograft: A graft of tissue from a different species.
X-ray: An image obtained by shining high-energy electrons through a tissue.
X-ray myelogram: An image of the spinal canal obtained with an X-ray machine after first injecting dye into the spinal fluid.
yoga: An exercise-based treatment in use for thousands of years for general health and well being. It is also used for the treatment of some types of spinal pain.