The region of the spine where the disc to height ratio is greatest?

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Discs relative to the size of their adjacent vertebrae vary along the spine, with the cervical region having the largest proportion of disc height to vertebral body height. The vertebral bodies in the neck are small, while the intervertebral discs are relatively thick to allow a wide range of motion, giving the greatest disc-to-height ratio there. In the thoracic region, discs are smaller due to rib attachments; in the lumbar region, discs are thick but the vertebral bodies are larger as well, reducing the ratio; the sacral area has fused bones and no intervertebral discs. So, the cervical spine has the greatest disc-to-height ratio.