The term PART OF THE SPINE can be broken down into two crossword solutions: VERTEBRA (8 letters) and DISK (4 letters). The vertebrae are the bones that make up the spine, which is a column of bones that runs from the base of the skull to the pelvis. The disks are the soft, spongy discs that separate the vertebrae and act as shock absorbers for the spine. Together, the vertebrae and disks form the spine, which is an essential part of the human body that provides support and protection for the spinal cord and other organs.