The term 'spine parts' can refer to the intervertebral disks and DISCS of the spine. The intervertebral disks are composed of a tough outer layer of cartilage and a softer inner layer of gelatinous material, which act as shock absorbers for the spine. The intervertebral DISCS are fibrocartilaginous structures that separate the vertebrae and provide stability to the spine. Both the disks and DISCS are essential components of the spine, and together they help to protect the spinal cord and nerves from injury.