The website of the Spinal Injury Network has a diagram of the human spine, with the different sections labeled. The spinal column is divided into five regions: cervical, thoracic, lumbar, sacral and coccygeal.
Starting from the base of the brain and extending to the waist, the spinal cord measures around 18 inches. It is protected by vertebrae, which are rings of bone surrounding it.
There are 8 vertebrae in the neck, called the cervical vertebrae. They are named C1, C2 and so on. There are 12 vertebrae in the chest, called the thoracic vertebrae, also named T1, T2 and so on. There are 5 lumbar vertebrae (L1 to L5) and also 5 sacral vertebrae (S1 to S5).
In general, a person will experience more dysfunction the closer to the brain a spinal injury occurs.