Vertebral artery: Bilateral arteries, that thread through holes in the six upper cervical vertebrae and join together to form the basilar artery supplying blood to the back portion of the brain.

Vertigo: Vertigo is not a disease in itself, but rather a symptom that can have any number of causes. Sensation of motion, dizziness or spinning. The feeling that oneself or one's surroundings are whirling about when no motion is occurring, or an exaggerated response to normal bodily motion.

Viscero-Somato: Nerve pathways originating in the organs of the body and communicating with the spinal cord.