What is the vertebral column structure?

• A. Cervical, thoracic, lumbar vertebrae; sacrum and coccyx; intervertebral discs between most vertebrae.
• B. Only cervical and thoracic vertebrae; no discs.
• C. A single fused bone.
• D. The vertebral column is not segmented.

Answer: (A)

The vertebral column is a segmented stack of bones forming the spine, organized into cervical, thoracic, and lumbar regions, with the sacrum and coccyx at the base. Intervertebral discs sit between most adjacent vertebrae, cushioning movement and allowing some flexibility. This arrangement provides both stability and mobility, which is why the description that lists cervical, thoracic, and lumbar vertebrae plus the sacrum and coccyx and intervertebral discs is the best choice. The spine includes the lumbar region as well, and there are discs between vertebrae rather than no discs. It is not a single fused bone; the vertebrae remain distinct bones joined by joints and discs, with some segments (sacrum and coccyx) fused.