A vertebra (plural: vertebrae) is an individual bone in the flexible column that defines vertebrate animals, for example humans. The vertebral column encases and protects the spinal cord, which runs from the base of the cranium down the dorsal side of the animal until reaching the pelvis. From there, vertebra continue into the tail. Vertebrae are defined by regions. Cervical vertebrae are those in the neck area, and can range from a single vertebra in amphibians, to seven in most mammals and re… (More on Vertebrae)