Full Cranial Nerve X - Vagus Nerve Description
[Continued from above] . . . fibers carry impulses from the lining of the larynx, pharynx, esophagus, thorax and abdomen to the brain. The involuntary motor fibers supply the heart and several of the smooth muscles and glands in the organs of the thorax and abdomen. Since these nerves are the tenth pair of cranial nerves, they are numbered X.