The Spinal Cord is divided into five parts:

The main 4 are the cervical, thoracic, lumbar and sacral  portions of the cord,
each of which has several more-or-less redundant "levels" of its own, numbered
according to the spinal column vertebrae through whose openings, the spinal
"roots"  emerge to form the peripheral nervous system.  A fifth part of the
spinal cord, the filum terminale, consists of tracts of fibers that extend below
the sacral cord before exiting to the periphery.