To try to locate a herniated disk in his spine, Liang's surgeon injects a special x-ray dye into his spinal canal and records it with an x-ray. This procedure is called a(n):

(1 point)
O myelography.
O arthroscopy.
O arthrography.
O electromyography.

myelography.

The procedure described, in which a special x-ray dye is injected into the spinal canal and recorded with an x-ray, is called a myelography. Therefore, the correct answer is O myelography.