(side) view of a normal spine. The drawing shows the
locations of the five major spinal levels. The cervical
region has seven vertebrae (C1 through C7), the thoracic
region has 12 vertebrae (T1 through T12) and the lumbar
region has five vertebrae (L1 through L5). The sacral
region consists of five vertebrae, all fused together
to form one continuous bone mass known as the sacrum.
The coccygeal region consists of four vertebrae, all
fused together to form the coccyx or tailbone.