How are Vertebrate Classified?
The human spine is made up of 33 vertebrae bones. The vertebrae are irregular bones that are in a classified based on location:
- Cervical spine (C1 – C7)
- Thoracic spine (T1 – T12)
- Lumbar spine (L1 – L5)
As the building blocks of the spine, the vertebrae, facets, and the discs combine to create the natural curve of the spine. For the lumbar and cervical spine, stacking the vertebrae one on top of the other would create a straight column, but the angular shape of the discs is what creates the normal curve in these sections. For the thoracic spine, it is the unique shapes of the vertebrae along with the discs that help create the normal curvature of this section.